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http://accurateshooter.wordpress.com/2009/04/01/us-army-team-tests-radical-new-dimpled-bullet/

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At the U.S. Army�s Aberdeen Proving Ground, a team of ballistics technicians, supported by some of the U.S. Army�s top sniper instructors, has been quietly developing a radical new �dimpled� bullet. The exterior of the bullet resembles the dimpled surface of a golf ball. The function of the special dimpled skin is to reduce projectile drag, providing a flatter long-range trajectory, and greater retained energy at the target.

.338 Projectile with MIM Exo-Jacket
(3D-CAD Artist�s Rendering)

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In their pursuit of a lower-drag bullet, the Army tried a variety of designs, including bullets with circumferential drive bands, dual-radius ogives, and rebated boat-tails. The dimpled �golf-ball� design was considered a �long shot� according to the design team, but it has performed beyond all expectations. The nominal drag coefficient (Cd) has improved by about +.040, while cartridge muzzle velocity has increased by nearly 80+ fps because the bullet�s dimpled skin reduces in-barrel friction. What�s more � the terminal performance of the dimpled bullet has been �spectacular�. The Aberdeen team set out to produce a slightly more slippery bullet for U.S. Army snipers. What they ended up with is a bullet with dramatically enhanced long-range ballistics and superior killing power on �soft targets�.

Lt. Col. Ben Eldrick, Long-Range Projectile Project (LRPP) team leader, told AccurateShooter.com how the radical bullet was conceived: �During our initial design work, we wanted the benefits of a high-BC, pointed bullet, but in a design that could be mass-produced and could work as a tracer. We consulted some of the top civilian bullet experts, including ballistician Bryan Litz of Berger Bullets. Mr. Litz really got the ball rolling. He suggested that the �next big step� in bullet design would involve the turbulent boundary layer over the body of the bullet. Litz told us that �pointing bullet tips will take you only so far� think about optimizing the airflow over the entire bullet�. That made a lot of sense to us. When you design a race car to be aerodynamic, you sculpt the whole body, not just the front bumper.�

[Linked Image]

Lt. Col. Eldrick continued: �It turns out Litz was right on the money. By employing a golf-ball type dimpled surface, we were able to optimize the turbulent boundary layer on the bullet body. This reduced the low-pressure wake zone behind the bullet significantly, resulting in reduced base drag. As a result the bullet experiences much less overall drag, effectively raising the BC.� The Army team had discovered that what works for golf balls also works for bullets.

[Linked Image]

After testing a series of prototypes, the Aberdeen bullet design team settled on a copper-jacketed bullet with dimples about 0.5 mm in diameter. The first-generation bullets were formed in special binary impact swages that press-form the dimples after the bullets were pointed up in conventional dies. Future production bullets will be made with an advanced metal-injection-molding (MIM) process that forms the dimples directly into the surface of the bullets. Rather than simply wrap the core material (which is classified), the MIM is molecularly bonded to the core. The Aberdeen LRPP team calls this �Exo-Jacket� construction, as in �Exo-Skeleton�.

Higher Velocities Achieved

There was a surprise benefit of the dimpled bullet design � higher muzzle velocities. Given the same powder charge, dimpled bullets exit the muzzle faster because they produce less in-barrel friction than do conventional bullets. This is because the recessed dimples effectively reduce the metal-on-metal bearing surface. Lt. Col. Eldrick revealed: �the added velocity was an unexpected bonus. With equal-pressure loads, dimpled .308 bullets will fly about 80 fps faster than normal .308 bullets. With the large .338-caliber projectiles, the difference is even greater� we can pick up nearly 150 fps.� Given the observed velocity gains achieved with dimpled bullets, Aberdeen designers are now working on dimpled shell casings for larger artillery projectiles.

[Linked Image]

Dimpled Jacket Delivers �Explosive� Fragmentation

While the internal design and core materials of the new dimpled bullet remain classified, the design team revealed that the terminal performance of the new bullet has been �spectacular�. The bullet penetrates like a FMJ but then explosively fragments, resulting in a devastating energy release in the target. According to Capt. Jack Sarazen, an Aberdeen engineer, �the enhanced terminal performance of the dimpled bullet was unanticipated. This was a serendipitous effect of the slight thinning of the jacket material where the dimples are pressed.� Sarazen explained: �Most FMJ bullets break along the cannelure and then fragment into two or three large pieces. With the dimpled bullets, you have multiple fragmentation points so the bullet literally blows up like a grenade in the target.�



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Sounds interesting. For hunting, mixed bag at least, the might be the catch right there
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�Most FMJ bullets break along the cannelure and then fragment into two or three large pieces. With the dimpled bullets, you have multiple fragmentation points so the bullet literally blows up like a grenade in the target.�


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CMG,

The same thing might scupper it as a Military round as it may fall foul under the terms of the Geneva Conventions in the same way dum-dums do..

Interesting article though, especially the promise it holds for artillery shells..

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According to the Military JAGs the SMK meets the legal definitions of a FMJ and it definately expands and fragments and it is not the first Military FMJ to do this.

It is the Hague accord not the Geneva Convention and the US is not nor never has been a part of the Hague Accord



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I'll wait for the grooved version.

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I'd heard of the controversy over the SMK, but I've no idea just how the legal experts arrive at an opinion on these things..

Regardless, the dipple concept is very interesting...I read some where that similar ideas are being researched for use on the hulls of ships and subs as a way to reduce drag.


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The Sierra Matchking does not expand like a soft point at the ranges it is used by military snipers. In order to make it expand, you need an impact velocity of 2300 fps or more.
Because it is used at extended ranges, and impacts at a much lower velocity than that, the Military JAG's determined that it is not, as it was used, an expanding bullet under the accords. E

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I got banned on another web site for a debate that happened on this site. That's a first
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Originally Posted by Eremicus
The Sierra Matchking does not expand like a soft point at the ranges it is used by military snipers. In order to make it expand, you need an impact velocity of 2300 fps or more.
Because it is used at extended ranges, and impacts at a much lower velocity than that, the Military JAG's determined that it is not, as it was used, an expanding bullet under the accords. E



The Military is well aware that the SMK expands and fragments and since I have used them on game as have others, it is not true that they need 2300 FPS to expand.


This bullet was recovered by a friend of mine from a Moose at 982 yards and I'd say that it expanded just fine

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Model rocketeers have known for a while that a dimpled surface will apparently decrease drag and make the rocket fly higher. The challenge is to create a dimpled surface using what is at hand for the average hobbyist.

Another trick is a nose cone larger in diameter than the body of the rocket--it seems to accomplish the same thing in that the separation of the boundry layer of air occurs further down the body of the rocket. The trick is to find the right angle of transition from larger diameter nose cone to the body--apparently it can make a big difference.


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Having said that, MAGA.
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Originally Posted by Eremicus
The Sierra Matchking does not expand like a soft point at the ranges it is used by military snipers. In order to make it expand, you need an impact velocity of 2300 fps or more.
Because it is used at extended ranges, and impacts at a much lower velocity than that, the Military JAG's determined that it is not, as it was used, an expanding bullet under the accords. E




I recovered this SMK that impacted at about 1700 FPS according to ExBal and it expanded quite well IMHO

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Originally Posted by Eremicus
The Sierra Matchking does not expand like a soft point at the ranges it is used by military snipers. In order to make it expand, you need an impact velocity of 2300 fps or more.
Because it is used at extended ranges, and impacts at a much lower velocity than that, the Military JAG's determined that it is not, as it was used, an expanding bullet under the accords. E


Doesn't explain at all the use of the 77 smk in the AR platform.... Not being picky but as pointed out the SMK does expand and most sniper shots are not as far as one would think in support of troops. If thats the Jags explanation, its damn weak. Though as mentioned the way I understand tahts a Hague issue of which we've never been a part.


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Originally Posted by jwp475


After testing a series of prototypes, the Aberdeen bullet design team settled on a copper-jacketed bullet with dimples about 0.5 mm in diameter. The first-generation bullets were formed in special binary impact swages that press-form the dimples after the bullets were pointed up in conventional dies. Future production bullets will be made with an advanced metal-injection-molding (MIM) process that forms the dimples directly into the surface of the bullets. Rather than simply wrap the core material (which is classified), the MIM is molecularly bonded to the core. The Aberdeen LRPP team calls this �Exo-Jacket� construction, as in �Exo-Skeleton�.



MIM or metal-injection-molding Will allow them to play with the shape and the composition of whatever there making the bullet out of,almost at will.MIM for bullets.Interesting stuff.
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Hague convention on bullets:
http://avalon.law.yale.edu/19th_century/dec99-03.asp

"The Contracting Parties agree to abstain from the use of bullets which expand or flatten easily in the human body, such as bullets with a hard envelope which does not entirely cover the core, or is pierced with incisions.

The present Declaration is only binding for the Contracting Powers in the case of a war between two or more of them.

It shall cease to be binding from the time when, in a war between the Contracting Parties, one of the belligerents is joined by a non-Contracting Power. "

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I think that dimpled bullet thing was an April Fools joke.


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Here is the Legal reasoning why the SMK is a legal bullet for Military use



Sniper Use of Open-Tip Ammunition

--------------------------------------------------------------------------------

MEMORANDUM FOR COMMANDER, UNITED STATES ARMY SPECIAL OPERATIONS COMMAND

SUBJECT: Sniper Use of Open-Tip Ammunition

DATE: 12 October 1990

1.Summary.

This memorandum considers whether United States Army Snipers may employ match-grade, "open-tip" ammunition in combat or other special missions. It concludes that such ammunition does not violate the law of war obligations of the United States, and may be employed in peacetime or wartime missions of the Army.
2.Background.

Sierra MatchKing 168-grain match grade boat tail For more than a decade two bullets have been available for use by the United States Army Marksmanship Unit in match competition in its 7.62mm rifles. The M118 is a 173-grain match grade full metal jacket boat tail, ogival spitzer tip bullet, while the M852 is the Sierra MatchKing 168-grain match grade boat tail, ogival spitzer tip bullet with an open tip. Although the accuracy of the M118 has been reasonably good, though at times erratic, independent bullet comparisons by the Army, Marine Corps, and National Guard marksmanship training units have established unequivocally the superior accuracy of the M852. Army tests noted a 36% improvement in accuracy with the M852 at 300 meters, and a 32% improvement at 600 yds; Marine Corps figures were twenty-eight percent accuracy improvement at 300 m, and 20% at 600yds. The National Guard determined that the M852 provided better bullet groups at 200 and 600 yards under all conditions than did the M118. [FNa1]

The 168-grain MatchKing was designed in the late 1950's for 300 m. shooting in international rifle matches. In its competitive debut, it was used by the 1st place winner at the 1959 Pan American Games. In the same caliber but in its various bullet lengths, the MatchKing has set a number of international records. To a range of 600 m., the superiority of the accuracy of the M852 cannot be matched, and led to the decision by U.S. military marksmanship training units to use the M852 in competition.

A 1980 opinion of this office concluded that use of the M852 in match competition would not violate law of war obligations of the United States. (citation omitted) Further tests and actual competition over the past decade have confirmed the superiority of the M852 over the M118 and other match grade bullets. For example, at the national matches held at Camp Perry, OH in 1983, a new Wimbledon record of 2--015 X's was set using the 168-gr. MatchKing. This level of performance lead to the question of whether the M852 could be used by military snipers in peacetime or wartime missions of the Army.

During the period in which this review was conducted, the 180-gr. MatchKing (for which there is no military designation) also was tested with a view to increased accuracy over the M852 at very long ranges. Because two bullet weights were under consideration, the term "MatchKing" will be used hereinafter to refer to the generic design rather than to a bullet of a particular weight. The fundamental question to be addressed by this review is whether an open-tip bullet of MatchKing design may be used in combat.
3.Legal Factors.

The principal provision relating to the legality of weapons is contained in Art. 23e of the Annex to Hague Convention IV Respecting the Laws and Customs of War on Land of 18 October 1907, which prohibits the employment of "arms, projectiles, or material of a nature to cause superfluous injury." In some law of war treatises, the term "unnecessary suffering" is used rather than "superfluous injury." The terms are regarded as synonymous. To emphasize this, Art. 35, para. 2 of the 1977 Protocol I Additional to the Geneva Conventions of August 12, 1949, states in part that "It is prohibited to employ weapons [and] projectiles . . . of a nature to cause superfluous injury or unnecessary suffering." Although the U.S. has made the formal decision that for military, political, and humanitarian reasons it will not become a party to Protocol I, U.S. officials have taken the position that the language of Art. 35(2) of Protocol I as quoted is a codification of customary international law, and therefore binding upon all nations. The terms "unnecessary suffering" and "superfluous injury" have not been formally defined within international law. In determining whether a weapon or projectile causes unnecessary suffering, a balancing test is applied between the force dictated by military necessity to achieve a legitimate objective vis-�-vis suffering that may be considered superfluous to achievement of that intended objective. The test is not easily applied. For this reason, the degree of "superfluous" injury must be clearly disproportionate to the intended objectives for development and employment of the weapon, that is, it must outweigh substantially the military necessity for the weapon system or projectile. The fact that a weapon causes suffering does not lead to the conclusion that the weapon causes unnecessary suffering, or is illegal per se. Military necessity dictates that weapons of war lead to death, injury, and destruction; the act of combatants killing or wounding enemy combatants in combat is a legitimate act under the law of war. In this regard, there is an incongruity in the law of war in that while it is legally permissible to kill an enemy combatant, incapacitation must not result inevitably in unnecessary suffering. What is prohibited is the design (or modification) and employment of a weapon for the purpose of increasing or causing suffering beyond that required by military necessity. In conducting the balancing test necessary to determine a weapon's legality, the effects of a weapon cannot be viewed in isolation. They must be examined against comparable weapons in use on the modern battlefield, and the military necessity for the weapon or projectile under consideration. In addition to the basic prohibition on unnecessary suffering contained in Art. 23e of the 1907 Hague IV, one other treaty is germane to this review. The Hague Declaration Concerning Expanding Bullets of 29 July 1899 prohibits the use in international armed conflict:

�". . . of bullets which expand or flatten easily in the human body, such as bullets with a hard envelope which does not entirely cover the core or is pierced with incisions."�
The U.S. is not a party to this treaty, but U.S. officials over the years have taken the position that the armed forces of the U.S. will adhere to its terms to the extent that its application is consistent with the object and purpose of Art. 23e of the Annex to the Hague Convention IV, quoted above.

It is within the context of these two treaties that questions regarding the legality of the employment of the MatchKing "open tip" bullet must be considered.
4.Bullet Description.

As previously described, the MatchKing is a boat tail, ogival spitzer tip bullet with open tip. The "open tip" is a shallow aperture (approximately the diameter of the wire in a standard size straight pin or paper clip) in the nose of the bullet. While sometimes described as a "hollow point," this is a mischaracterization in law of war terms. Generally a "hollow point" bullet is thought of in terms of its ability to expand on impact with soft tissue. Physical examination of the MatchKing "open tip" bullet reveals that its opening is extremely small in comparison to the aperture in comparable hollow point hunting bullets; for example, the 165-grain GameKing is a true hollow point boat tail bullet with an aperture substantially greater than the MatchKing, and skiving (serrations cut into the jacket) to insure expansion. In the MatchKing, the open tip is closed as much as possible to provide better aerodynamics, and contains no skiving. The lead core of the MatchKing bullet is entirely covered by the bullet jacket. While the GameKing bullet is designed to bring the ballistic advantages of a match bullet to long range hunting, the manufacturer expressly recommends against the use of the MatchKing for hunting game of any size because it does not have the expansion characteristics of a hunting bullet.

The purpose of the small, shallow aperture in the MatchKing is to provide a bullet design offering maximum accuracy at very long ranges, rolling the jacket of the bullet around its core from base to tip; standard military bullets and other match bullets roll the jacket around its core from tip to base, leaving an exposed lead core at its base. Design purpose of the MatchKing was not to produce a bullet that would expand or flatten easily on impact with the human body, or otherwise cause wounds greater than those caused by standard military small arms ammunition.
5.MatchKing performance.

Other than its superior long range marksmanship capabilities, the MatchKing was examined with regard to its performance on impact with the human body or in artificial material that approximates human soft tissue. It was determined that the bullet will break up or fragment in some cases at some point following entry into soft tissue. Whether fragmentation occurs will depend upon a myriad of variables, to include range to the target, velocity at the time of impact, degree of yaw of the bullet at the point of impact, or the distance traveled point-first within the body before yaw is induced. The MatchKing has not been designed to yaw intentionally or to break up on impact. These characteristics are common to all military rifle bullets. There was little discernible difference in bullet fragmentation between the MatchKing and other military small arms bullets, with some military ball ammunition of foreign manufacture tending to fragment sooner in human tissue or to a greater degree, resulting in wounds that would be more severe than those caused by the MatchKing. [FNaaa1]

Because of concern over the potential mischaracterization of the M852 as a "hollow point" bullet that might violate the purpose and intent of the 1899 Hague Declaration Concerning Expanding Bullets, some M852 MatchKing bullets were modified to close the aperture. The "closed tip" MatchKing did not measure up to the accuracy of the "open tip" MatchKing.

Other match grade bullets were tested. While some could approach the accuracy standards of the MatchKing in some lots, quality control was uneven, leading to erratic results. No other match grade bullet consistently could meet the accuracy of the open-tip bullet.
6.Law of War Application.

From both a legal and medical standpoint, the lethality or incapacitation effects of a particular small-caliber projectile must be measured against comparable projectiles in service. In the military small arms field, "small caliber" generally includes all rifle projectiles up to and including .60 caliber (15mm). For the purposes of this review, however, comparison will be limited to small-caliber ammunition in the range of 5.45mm to 7.62mm, that is, that currently in use in assault or sniper rifles by the military services of most nations.

Wound ballistic research over the past fifteen years has determined that the prohibition contained in the 1899 Hague Declaration is of minimal to no value, inasmuch as virtually all jacketed military bullets employed since 1899 with pointed ogival spitzer tip shape have a tendency to fragment on impact with soft tissue, harder organs, bone or the clothing and/or equipment worn by the individual soldier.

The pointed ogival spitzer tip, shared by all modern military bullets, reflects the balancing by nations of the criteria of military necessity and unnecessary suffering: its streamlined shape decreases air drag, allowing the bullet to retain velocity better for improved long-range performance; a modern military 7.62mm bullet will lose only about one-third of its muzzle velocity over 500 yards, while the same weight bullet with a round-nose shape will lose more than one-half of its velocity over the same distance. Yet the pointed ogival spitzer tip shape also leads to greater bullet breakup, and potentially greater injury to the soldier by such a bullet vis-�-vis a round-nose full-metal jacketed bullet. (See Dr. M. L. Fackler, "Wounding Patterns for Military Rifle Bullets," International Defense Review, January 1989, pp. 56-64, at 63.)

Weighing the increased performance of the pointed ogival spitzer tip bullet against the increased injury its breakup may bring, the nations of the world-- through almost a century of practice--have concluded that the need for the former outweighs concern for the latter, and does not result in unnecessary suffering as prohibited by the 1899 Hague Declaration Concerning Expanding Bullets or article 23e of the 1907 Hague Convention IV. The 1899 Hague Declaration Concerning Expanding Bullets remains valid for expression of the principle that a nation may not employ a bullet that expands easily on impact for the purpose of unnecessarily aggravating the wound inflicted upon an enemy soldier. Such a bullet also would be prohibited by article 23e of the 1907 Hague IV, however. Another concept fundamental to the law of war is the principle of discrimination, that is, utilization of means or methods that distinguish to the extent possible legitimate targets, such as enemy soldiers, from noncombatants, whether enemy wounded and sick, medical personnel, or innocent civilians. The highly trained military sniper with his special rifle and match grade ammunition epitomizes the principle of discrimination. In combat, most targets are covered or obscured, move unpredictably, and as a consequence are exposed to hostile fire for limited periods of time. When coupled with the level of marksmanship training provided the average soldier and the stress of combat, a soldier's aiming errors are large and hit probability is correspondingly low. While the M16A2 rifle currently used by the United States Army and Marine Corps is capable of acceptable accuracy out to six hundred meters, the probability of an average soldier hitting an enemy soldier at three hundred meters is ten percent.

Statistics from past wars suggest that this probability figure may be optimistic. In Would War II, the United States and its allies expended 25,000 rounds of ammunition to kill a single enemy soldier. In the Korean War, the ammunition expenditure had increased four-fold to 100,000 rounds per soldier; in the Vietnam War, that figure had doubled to 200,000 rounds of ammunition for the death of a single enemy soldier. The risk to noncombatants is apparent.

In contrast, United States Army and Marine Corps snipers in the Vietnam War expended 1.3 rounds of ammunition for each claimed and verified kill, at an average range of six hundred yards, or almost twice the three hundred meters cited above for combat engagements by the average soldier. Some verified kills were at ranges in excess of 1000 yards. This represents discrimination and military efficiency of the highest order, as well as minimization of risk to noncombatants. Utilization of a bullet that increases accuracy, such as the MatchKing, would further diminish the risk to noncombatants.
7.Conclusion.

The purpose of the 7.62mm "open-tip" MatchKing bullet is to provide maximum accuracy at very long range. Like most 5.56mm and 7.62mm military ball bullets, it may fragment upon striking its target, although the probability of its fragmentation is not as great as some military ball bullets currently in use by some nations. Bullet fragmentation is not a design characteristic, however, nor a purpose for use of the MatchKing by United State Army snipers. Wounds caused by MatchKing ammunition are similar to those caused by a fully jacketed military ball bullet, which is legal under the law of war, when compared at the same ranges and under the same conditions. The military necessity for its use-- its ability to offer maximum accuracy at very long ranges--is complemented by the high degree of discriminate fire it offers in the hands of a trained sniper. It not only meets, but exceeds, the law of war obligations of the United States for use in combat.
This opinion has been coordinated with the Department of State, Army General Counsel, and the Offices of the Judge Advocates General of the Navy and Air Force, who concur with its contents and conclusions.

An opinion that reaches the same conclusion has been issued simultaneously for the Navy and Marine Corps by The Judge Advocate General of the Navy.


Authored by W. Hays Parks, Colonel, USMC,
Chief of the JAG's International Law Branch
FNa1. The M118 bullet is loaded into a 7.62mm (caliber .308) cartridge. In its original loading in the earlier .30-06 cartridge, it was the M72.

FNaa1. While this review is written in the context of the M852 Sierra MatchKing 168-grain "open-tip" bullet and a 180-grain version, the MatchKing bullet (and similar bullets of other manufacturers) is also produced in other bullet weights of 7.62mm rifles (.308, .30-06, or .300 Winchester Magnum).

FNaaa1. For example, 7.62mm bullets manufactured to NATO military specifications and used by the Federal Republic of Germany have a substantially greater tendency to fragment in soft tissue than do the U.S. M80 7.62mm ammunition made to the same specifications, the M118, or the M852 MatchKing. None fragment as quickly or easily upon entry into soft tissue as the 5.56mm ammunition manufactured to NATO standards and issued to its forces by the Government of Sweden. Its early fragmentation leads to far more severe wounds than any bullet manufactured to military specifications and utilized by the U.S. military during the past quarter century (whether the M80 7.62mm, the M16A1, M193 or M16A2 5.56mm) or the opentip MatchKing bullet under consideration.




http://www.thegunzone.com/opentip-ammo.html#FNaaa1



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Interesting read. Though i've never understood, trying to kill folks is the end goal in the war anyway


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Interesting stuff for sure. Might be relevant to a few. It's my guess that Joe Average Hunter's shooting skills still lag quite a way behind the currently available technology. Mine sure does.


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Read on another site the dimpled bullet thing was also an April Fool's Joke.

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I do know that dimples on projectiles have been talked about before... I read about the idea years back somewhere. Might have been a joke then too.

We need Chris F to chime in, I"ll email and see what info he has.

Jeff


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