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"It's dynamic hydraulic impact � why not call it that?"

Bernoulli went with "hydrodynamic" - that works for me <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />.


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This is one of the oft argued topics in riflery related to hunting, so it's always worth one more round, right?

My own experience includes "autopsying" well over 300 deer. Nobody seems to resist when you volunteer for that duty, and for many years, I was so fascinated with the results that I'd almost always volunteer for that duty. I hunt the south, where our average whitetails run from 120-180 lbs. AVERAGE, so my comments will apply specifically to them, and NOT to the larger 200+ pounders typically found in other regions.

In my experience, the thread on Rem. Core Lokt bullets, and more particularly MD and others' assertion that up to 2800 fps. (and on SMALLER, under 200-250 lb. whitetails, etc. up to 3100 fps. or so), conventional cup and core bullets work very well. I don't shoot deer in the butt, so disregard these comments in regard to that type of shot.

My experience and observation indicates that there's nothing that really surpasses the traditional "soft" cup and core bullets on whitetails, and I'd include velocities up to 3100 fps. I shoot Nosler Ballistic Tips a lot, and they're devastating on our southern whitetails. I should also note that I usually hunt from tree stands, and that this (in part) allows me to wait for good broadside or shallow angled shots.

These factors combine so that, to date, I've rarely had to track any of my own deer. I've had to track some that others have shot, and I don't like it. I like my deer to drop at the shot, and I like to find it right where it stood when I pulled the trigger.

To date, NOTHING works as well as a "soft" traditional cup and core bullet, or the Nosler BT's for accomplishing just that.
Now I realize that not ALL of us hae the luxury of being able to wait for a broadside or near broadside shot, of course, so those who "must," for whatever reason, take other type shots may want to seek advice elsewhere on THAT subject. However, it's also been my experience that most deer WILL give us a good profile for a shot IF we can just show a little patience.

I trained myself early on, because I got so excited when a deer would appear, to just FREEZE on my initial sighting of a deer. Then I'd force myself to actually THINK for a second, and determine just how much time I had to make the shot - which usually turned out to be plenty enough to wait for a good profile for the shot. This helped me place my shots, and no doubt saved me some "lost" evenings out in the woods with a flashlight - something I do NOT like when I could be back home swapping lies about the hunt and frying up some backstrap with some onions, Worstershire and whatever else seems appealing at the moment. I love venison as much as I abhor tracking! Learning to freeze at the first appearance of a deer eliminates the adrenaline response that so often leads us to hasty mistakes.

Anyway, I also learned that if I move the rifle v-e-r-y
s-l-o-w-l-y, I could bring the rifle to shoulder with a deer right UNDER me. This wasn't a small finding! It's enabled me to eliminate virtually all need for shooting running deer, which all too often results in tracking - did I mention I just HATE doing that? After all, a deer lives in the woods, and the tree branches are nearly always moving, even if moderately, and birds fly, etc., so deer mainly notice only movement that is too fast, and thus seems threatening to them. They don't notice very slow movement at all, typically.

Combining these two simpe principles - freezing to calm down before the shot (which allows waiting for a broadside or nearly broadside shot) and moving the rifle very slowly so as not to be noticed by the deer - I've been able to compile a record of one shot in-the-tracks kills that would at first seem impressive. However, it's really not anything that most all of us can't do, if you think about it a minute. Think about it a second. Freezing initially gets us past the adrenal rush and allows us to THINK instead of merely react. Deer aren't dangerous, so this is good here. Then, moving slowly won't scare the deer into forcing us to make a running shot, or worse, pulling the trigger just as it moves. Simple. Effective. Reliable.

Now comes the in-the-tracks part of the "secret." I've shot the bulk of these little whitetails with .270's, '06's, .308's and a 6mm. Rem. Deer are big targets, really. A lot bigger than the 8" paper plate many use to check their sights! Standing deer are actually pretty easy to hit, and hit well - IF they're standing and unalarmed. The meat may taste a mite better if they're not pumping adrenaline as well, so there are many reasons to seek a standing broadside shot. The "trick" is to put them down right where they stand, and that's where "hydrostatic shock" comes into play.

In my experience, a standing broadside deer shot in the forward part of the lungs in the high heart area, will typically fall at the shot and not move from that shot if shot with the typical .270/'06/.308 with the lighter (130 gr. .270 or 250 gr. '06/.308's) cup and core or BT bullets, or some similar caliber and load. At the shot, they'll typically act as if a strong electrical current had hit them suddenly, sometimes will stiffen (if there's time to notice) and just collapse. THIS is what we all seek! If the heart is hit, they'll usually make a mad dash for some 25-40 yds. and then collapse. Scares me near to death, so I try to avoid an actual heart shot!

However, though I've never hunted with them, I've noticed a clear trend among the stories I regard as "reliable" from those who shoot our little whitetails with the newer homogeneous bullets, like the X and TSX. They'll typically brag about hitting it "right in the heart" and wind up saying "... and it only went 50 (to 75 yds.) before piling up dead!" That's a good job, of course, and a clean kill - something we all seek - but for me, I'll take the traditional cup and core bullets or a BT ANY day over the harder, more limited expansion types, regardless of construction ... on whitetails, anyway. I've got some 250 gr. Nosler Partitions in case I get to make that elk hunt some day, but Jack O'Connor's comments about the fast/light bullets has proven itself on whitetails almost unerringly.

I HAVE found that the .30/30 and .270 are two of the most reliable calibers around, and one reason for this is that almost all bullets for them are designed specifically for these calibers, almost exclusively, and therefore the bullets used for them can be more nearly a "tailored fit" for their use. The .30/30 clearly doesn't kill QUITE as quickly, but with a good shot, it's often an in-the-tracks killer.

I have concluded that - FOR WHITETAILS SPECIFICALLY - hydrostatic shock DOES exist, and not only that, but it WORKS, and it works RELIABLY and WELL, but it works only by far better with the "softer" and quickly expanding bullets and velocities over about 2700 fps or so, on up to maybe 3100 fps.

WITHIN THESE SPECIFIC LIMITS, AND ON WHITETAILS, I believe hydrostatic shock is possibly one of a hunter's best freinds, and if one has the discipline and wherewithall to wait for a good shot, and place the bullet well, killing whitetails in their tracks is not only easy, it's really sort of our obligation as a good hunter.

Use a magnum and the above often doesn't apply. A buddy has lost some deer with 100 gr. .264's and 140 gr. BT's in the 7 mag., so the above isn't a genarality, it's a specific. However, it's the "secret" I've used for many years to avoid the dreaded and hated duty of tracking.

Does anyone else here use these little "tricks" to avoid having to track deer? I nearly lost one once, that went only 30 yds. It fell into a stump hole that was surrounded by briars, and nothing white showed, so it was very hard to see. I was about to abandon the search when I came back by it, and leaned over and shined the flashlight and found it. DARN! Over 1 1/2 hours of good cookin' time wasted!


I guess my experience is a little different. I tend to use 180 gr in my 30.06, that gives me an exit and a blood trail. Where I live, there is normally snow on the ground, and a 100 yard run is no big deal.


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I guess I'll ring in here.

First, I'd like to say that this has been one of the most in depth and interesting threads I've run across. Blackwater, thanks for taking time out to share. It would take me 4 days to type what you did. I'm SLOOOWWW.

I'm going to skip out on the intellectual side of this conversation, because I'm obviously outgunned, but I do want to address it on a more practical level. Whether we call it hydrostatic shock or hydraulic shock (I've always called it energy transfer) I'm 100% certain it exists in principal. Here's why.

Would you rather have your hand on top of an empty or a full soda can when it gets shot. I'd really prefer to avoid both, but if forced to take a pick I would opt for the empty, as I suspect the rest of the readership would. Not exactly apples to oranges here. Now reflect on the amount of damage to that full soda can with solids and expanding bullets. I equate the energy transfer of an expanding bullet to the concussion of an explosive. Even if the shrapnel doen't get you, the concussion can kill you. There is a shock wave in both cases. In the case of bullets, the more rapidly expanding bullets impart a more pronounced shock wave.

Trying to explain this reminds me of why I'm not an engineer or physical scientist!

Paul

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Ed Matunas wrote many years ago the reason he used mostly a 270 Win or a 338WM was that bullets of those diameters were essentially custom designed for the velocity of those two cartridges. At the time, the only commercially significant cartridge that used a .277 cal bullet was the 270 Win, same for the 338WM. That's why your 270 works so well. Contrast that with .308 bullets that are supposed to work at any velocity from a 300 Savage to a 300 Weatherby. A similar problem occurs at .284 caliber.
Of course, he worked for Winchester and Lyman during his career, so may have been a bit predjudiced in favor of Winchester factory loadings.
Your 35Whelan kills quickly and ruins little meat for the same reason my 338WM does the same. Moderate velocity and relatively large bullets produce a little hole in/modest hole out, and a liquified chest cavity in between. You can "eat right up to the bullet hole."

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Check out this web-site. If not already posted.

http://www.rathcoombe.net/sci-tech/ballistics/wounding.html

This is the most extensive collection of terminal ballistics I have ever seen and is written by a person who's career is related to bullet and projectiles.

One of the topics is hydrostaic shock.

After reading make your own conclusions.


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I can't intelligently comment on whether hydrostatic shock actually exists. I just don't know. But I am convinced that relatively soft, cup and core bullets fired at a muzzle velocity THAT THE BULLET WAS DESIGNED is more than adequate for any whitetail. I have only limited experience with the super premium bullets, but from what I've seen they're no better or perhaps not as good as "normal" bullets. And the cup and core bullets are generally more accurate and definitely cheaper. Happy hunting! <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />


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Thinking like that Arns9 will keep your game locker full and your bank account flush. <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />

Safe Shooting! <img src="/ubbthreads/images/graemlins/grin.gif" alt="" />
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I'm in the camp that needs a lot more convincing. Others have already posted about the various types of bullet damage, but in a "hydro" sense there are only two - hydrostatic and hydrodynamic.

Maybe a more accurate question is, "How much shock is caused by a hydrostatic wave?" My answer - Very little.

With all respect to Mr. Howell, I believe "hydrostatic" is the correct term for the energy wave that results in water-based tissue upon bullet impact - correct in that the water doesn't move (remains static). The wave is a result of the elasticity of water.

Body tissue, be it man or beast, is able to absorb this type of energy by not cotaining it - we stretch. This is why the "pop can" analogy doesn't fit.

Hydrodynamic damage is very real, and based on high velocity fluids ripping into adjacent tissue. While this damage can be extreme it's very localized.


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"Hydrodynamic damage is very real, and based on high velocity fluids ripping into adjacent tissue. While this damage can be extreme it's very localized. "

You hit the nail on the head and to extend that may I ask why accuracy would make any difference? If that shock wave goes all through the connected tissue in the entire body (it must) and because of the basic characteristics of wave energy including minmal energy loss in subsequent waveform energy transfer (hence radio waves that go forever into space) and repeated reflection through the body that means every area would be hit repeatedly.

And therein lies the essential rub. Wave energy is extremely efficient in transfering energy with minimal loss (that would be "dumping") and any bullet anywhere in the body would kill as efficiently any other... IF "hydrostatic shock" actually kills...
art


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Art,

You have two waves going in your argument: electromagnetic waves in free space (i.e. a vacuum with no material present); and longitudinal waves propagating in a physical medium.

The EM waves can go a long ways, but the pressure waves attenuate and disappear very quickly.

Ulf's paper emphasizes that the bullet damage is only due to the physical passage of the bullet.

In any case you need to shoot the bullet into the animal in a place where the damage kills quickly. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />

jim


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Jim
I understand the difference and knew the stretch I was making. Did so for clarity with mud? (grin) The point I was heading for though was the attenuation is not fast in terms of energy lost to the medium. The waves attenuate as a function of changing media and refractions and reflections from those changes. All of which takes time.

Look at ocean waves for a more valid example with little loss in energy when traveling completely across an ocean even when traveling across the paths of other wave trains.

And we agree completely on the need to shoot the bullet in a place where the damage kills quickly.
art


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FWIW Dept., I don't subscribe to the theory myself. The various densities found in tissue complicate a thoroughly complicated environment when dealing with terminal ballistics. Yes, energy is transfered, but I cannot accept that the wave forms in and of themselves do all of this dastardly damage. I believe wave energy dissipates by the third power as a function of radius from origin. It is at best a precipitous decline, and at any point where a bullet is administering energy, the localized tranfer is a small portion of what is available. And as to what is available, there is this problem of "equal and opposite reaction" . Is not the energy at the buttplate equal to that at the muzzle? Yes, one is heavy and slow, the other light and fast, but still...speed does not, in and of itself, kill things. You may call one "apples" and the other "oranges" if it suits you.

It is, in any case something that will not be resolved in my lifetime. If perchance it is, and I'm full of hooey, so be it. Drinks will be on me at The Grizzly Bar. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />


I am..........disturbed.

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Dang, I believe you boys are a bit ahead of me on this whole thang! But I think I got it. If you put a decent bullet at a sufficient speed into vital spots on an animal, you should be able to find it where you shot it or someplace reasonably close. Sound about right?

Hell you'd have to know shock don't kill..... would'nt the world have been rid of Mr. and Mrs. Clinton when that little blue dress with the mayonaise stain was found? <img src="/ubbthreads/images/graemlins/blush.gif" alt="" /> 1ak


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I believe the formula for energy dissipation is the reciprocal of the radius squared, rather than the third power...
art


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Yup!
art


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Art,

� If that shock wave goes all through the connected tissue in the entire body (it must)��

Okay, the Campfire can invite Boddington, but we gotta draw the line somewhere � No Pascal <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />.


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You know, I have always been more impressed with his early work on conic sections, pasrticularly as they relate to vacuum, a theory he fought all sorts of smart dudes over (like Descartes)...

Wish there were an evil-reprobate-leering-wink icon to install there! It would express my mood perfectly! LOL
art


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Art,

I was barely treading water as it was and you tossed me an anchor <img src="/ubbthreads/images/graemlins/help.gif" alt="" />.

I'll get back to you on the subject of conic sections...but don't wait up <img src="/ubbthreads/images/graemlins/wink.gif" alt="" />.


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I really didn't know I was as dumb as I apparently am until I read this thread.

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Forgot to mention the cube function is true of a single point, but the bullet path creates an axis and actually the difference between the axis and the projectile diameter requires factoring in the bullet diameter, so I cheated...
art


Mark Begich, Joaquin Jackson, and Heller resistance... Three huge reasons to worry about the NRA.
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