Home Forums Hunting & Shooting Rimfires Ballistic Coefficients of .22 RF rounds

In my likely futile hope of beating 7x57Steve at rimfire silhouette this year I'm going to have a CDS dial put on a spare Leupold VX-III I have and thus be able to more easily dial in the drop for the various targets. So, e-mailed Leupold and they're happy to do so and please provide the following info.

Cartridge: .22 Long Rifle
Bullet Type: Win Super X Truncate Cone Hollow Point
Bullet Weight: 40 grains
Ballistic Coef: _______________
Muzzle Velocity: 1085_fps
Altitude: 100 ft
Temp: 70 f
Sight-in Distance: 50 yds

So, herin lies the problem. Any idea on what the ballistic coefficient of the Winchester Super X 40 gr Trunated Cone HP is?(code X22LRSUBA)

I have three bricks of it and my Cooper loves it, delivering 5 shot dime sized groups at 50 yards. I did a bunch of searching and found these other .22's. Maybe I shouldn't sweat it and pick a middle range but the season doesn't start until April and I'll miss that match since I'll be in Texas Axis hunting so this isn't a rush but any help is appreciated.

RWS, 40-gr. R100 (213 4195), 1175 MV, 123 ME, 0.130 BC
REMINGTON, 40-gr. LR Target Solid (6122) (6100), 1150 MV, 117 ME, 0.149 BC
WINCHESTER, 40-gr. T22 LR Std. Vel. Solid (XT22LR), 1150 MV, 117 ME, 0.149 BC
FEDERAL, 40-gr. LR Ultramatch Solid (UM1), 1140 MV, 115 ME, 0.149 BC
FEDERAL, 40-gr. LR Match Solid (900), 1140 MV, 115 ME, 0.149 BC
AGUILA, 40-gr. LR Std. Vel., 1135 MV, 114 ME, 0.158 BC
PMC, 40-gr. Scoremaster LR Std. Vel. Solid (22SM), 1135 MV, 114 ME, 0.111 BC
FIOCCHI, 40-gr. LR Biathlon Match Solid (22SM340), 1120 MV, 111 ME, 0.140 BC=Estimated
AGUILA, 40-gr. LR Match Golden Eagle, 1100 MV, 110 ME, 0.109 BC
LAPUA, 40-gr. LR Polar Biathlon Solid (4317023), 1100 MV, 107 ME, 0.108 BC
ELEY, 40-gr. Tenex Ultimate EPS, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. Match EPS, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. Club, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. Target, 1085 MV, 105 ME, 0.105 BC
ELEY, 40-gr. Practice, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. Standard, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. Biathlon Match, 1085 MV, 105 ME, 0.150 BC
ELEY, 40-gr. LR Silhouex, 1085 MV, 105 ME, 0.150 BC
REMINGTON/ELEY,40-gr. Match EPS (RE22EPS), 1085 MV, 105 ME, 0.149 BC
REMINGTON/ELEY, 40-gr. Club Extra (RE22CX), 1085 MV, 105 ME, 0.149 BC
REMINGTON/ELEY, 40-gr. Target Rifle (RE22T), 1085 MV, 105 ME, 0.149 BC
AGUILA, 40-gr. Match Rifle, 1080 MV, 100 ME, 0.197 BC
SELLIER and BELLOT, 40-gr. LR SB Standard (SBA02201), 1084 MV, 104 ME, 0.131 BC
SELLIER and BELLOT, 40-gr. LR SB Standard (SBA02202), 1084 MV, 104 ME, 0.131 BC
FEDERAL, 40-gr. LR Ultramatch Solid (UM1B), 1080 MV, 105 ME, 0.139 BC
FEDERAL, 40-gr. LR Target Solid (711B), 1080 MV, 105 ME, 0.138 BC
FEDERAL, 40-gr. LR Match Solid (900B), 1080 MV, 105 ME, 0.139 BC
RWS, 40-gr. LR Target Rifle (213 2478), 1080 MV, 100 ME, 0.109 BC
CCI, 40-gr. LR Std. Vel. Solid (0032), 1070 MV, 100 ME, 0.105 BC
CCI, 40-gr. LR Green Tag Comp. Solid (0033), 1070 MV, 100 ME, 0.105 BC
CCI, 40-gr. LR Pistol Match Solid (0051), 1070 MV, 100 ME, 0.105 BC
RWS, 40-gr. LR R50 (21304187), 1070 MV, 100 ME, 0.105 BC
LAPUA, 40-gr. LR Master Solid (4317033), 1066 MV, 101 ME, 0.132 BC
LAPUA, 40-gr. LR Midas L Solid (4317022), 1066 MV, 101 ME, 0.132 BC
LAPUA, 40-gr. LR Midas M Solid (4317021), 1066 MV, 101 ME, 0.132 BC
NORMA 1, 40-gr. Lead, Round Nose (15613), 1066 MV, 101 ME, 0.132 BC
NORMA 2, 40-gr. Lead, Round Nose (15614), 1066 MV, 101 ME, 0.132 BC
NORMA 3, 40-gr. Lead, Round Nose (15615), 1066 MV, 101 ME, 0.132 BC
FIOCCHI, 40-gr. LR-Rifle Match Solid (22SM320), 1050 MV, 98 ME, 0.140 BC
FIOCCHI, 40-gr. LR Match Trng. Solid (22M320), 1050 MV, 98 ME, 0.130 BC
LAPUA, 40-gr. LR Super Club Solid (4317066), 1050 MV, 98 ME, 0.114 BC
LAPUA, 40-gr. LR Std. Rifle Club Solid (43122420), 1050 MV, 98 ME, 0.114 BC
PMC, 40-gr. Match Rifle (22MR), 1050 MV, 98 ME, 0.110 BC
RWS, 40-gr. LR Rifle Match (213 4225), 1035 MV, 95 ME, 0.096 BC
ELEY, 40-gr. Tenex Ultimate EPS Pistol, 1030 MV, 94 ME, 0.109 BC
ELEY, 40-gr. Pistol Xtra, 1030 MV, 94 ME, 0.109 BC
ELEY, 40-gr. Target Pistol, 1030 MV, 94 ME, 0.109 BC
LAPUA, 40-gr. LR Pistol King Solid (4317031), 1033 MV, 95 ME, 0.130 BC
LAPUA, 40-gr. LR Pistol Trainer Solid (4312260), 1033 MV, 95 ME, 0.130 BC
ELEY, 40-gr. Pistol Match, 1000 MV, 89 ME, 0.140 BC
FIOCCHI, 40-gr. LR Pistol Match Solid (22SM300), 984 MV, 86 ME, 0.130 BC
FIOCCHI, 40-gr. LR Match Trng. Solid (22M300), 984 MV, 86 ME, 0.125 BC
PMC, 40-gr. Match Pistol (22MP), 900 MV, 72 ME, 0.095 BC
WINCHESTER, 40-gr. LR Lead HP (W22LRB), 1150 MV, 117 ME, 0.150 BC
ELEY, 40-gr. LR Subsonic Xtra Plus, 1065 MV, 100 ME, 0.115 BC
RWS, 40-gr. LR Subsonic HP (213 2494), 1000 MV, 90 ME, 0.092 BC
LAPUA, 40-gr. LR Multi Match Solid (4317020), 1100 MV, 129 ME, 0.134 BC

Allen

Wish I could help, but do not know. Thank you for the research though.

Good luck with that. Wonder if anyone in the past has even thought of it.

Pugs, Is a question you might put to the RFC crowd. At what distances are you shooting? If you're heading out to 100 yards or more you might want to consider shooting at those distances to see how it does...out yonder...before you commit your scope mod to the project.

Dan,

Rimfire metallic silhouette is shot as follows

Gallina (chicken) targets at 40 yards
Javelina (pig) targets at 60 yards
Guajalote (turkey) targets at 77 yards
Borrego (ram) targets at 100 yards

I shot first match last year, after shooting hi-power silhouette a couple years, and we found it a lot more fun. I did adjust the VX-II on rifle between strings but wanted an easier way to do so. The target or M1 turret is a bit ungainly for a nice looking rifle that I also use for a woods rifle.

I looked over at RFC and didn't find much. http://benchrest.com/forums/ had most of the data I found. The whole issue may be pretty petty and I should just pick one and go with it.

Depends on the range. IIRC, the original official distances are in meters, with yards as an option.

Much of the character and details of the various silhouette games come from it's origin in Mexico.

Gaining popularity is the yet unsanctioned "mini-BPCR" .22 silhouette event. 50-200 meters under BPCR silhouette rules. The official/unofficial national championship is the Tornado Alley match near Oklahoma City in May.

Pugs et all, I admit to being technically challenged, but I've never had much luck calculating .22 rimfire trajectories and sight settings. Even lot-to-lot ammo variation adds to the challenge. I have to just do it empirically, by actual shooting.

Paul

Pull one of the bullets, measure it, apply JBM ballistics calculators;
http://www.jbmballistics.com/cgi-bin/jbmdrag-5.0.cgi

...but I think, for .22 you need to factor in how consistent the powder and primer charges are coming from the factory. In my experience, those seem to have a bigger accuracy affect than BC in rimfires.

You could find the most consistent ammo for your gun, then get one of those .22 bullet nose cutters to apply your own preferred meplat.

a good many things that we do, as shooters, night be considered petty, by some...
good luck in your quest, and post pics of your competitions...
always been fascinated by the temptation of rimfire sillywet...

All,

Thanks much for the suggestions and I'm particularly intrigued by Jeff's idea of pulling a bullet and checking it out. 7x57Steve and I have talked several times about what affects rimfire accuracy. He has measured rim thickness and didn't believe groups improved significantly when he sorted by that but he has had very good results in group improvement with grouping by weight so I think I'll give that a try (once the snow melts enough to find the target holders at the range! ) The three bricks I have of this ammo are all from the same lot so I hope they'll be more consistent than just random boxes.

Safely ensconced here at the house and my latest woodworking project all glued and clamped I thought why not take the BC's I have and see how much difference it makes in an external ballistics calculator? I ran the lowest and highest and a couple in the middle. The answer? Not much.

MV of 1100 fps (I bumped the Winchester spec up 15 fps/inch since it was fired out of a 5" barrel) and standard day (sighted in at 50 yards)

BC ****** 40 yards * 60 yards * 80 yards * 100 yards
.096 ______ +.4 ______ -.7 ______ -3.3 ______ -7.5
.108 ______ +.4 ______ -.7 ______ -3.2 ______ -7.3
.111 ______ +.4 ______ -.7 ______ -3.2 ______ -7.3
.150 ______ +.4 ______ -.7 ______ -3.1_______ -6.9

So, in theory, I should just pick a middle of the road BC and go with that. If I screw it up I won't be out but the $70 Leupold charges for the change and I'll end up with a scope with an easily adjustable turret that I'll just have to figure it out at the range.

I'll let you know how it goes.

Allen

Pugs, what you might consider is what ammo shoots best for you at 100 yards. The ammo you reference is subsonic and that's positive. Working against it is the truncated HP form which likely has a lower BC than most RN match ammo. Flat meplats carry baggage (drag)like that and HP designs are considered FP for BC calculation, although the meplat diameter is significant in figuring it.

OTOH, there is the issue of finding other ammo in this day and age....

That's why Steve and I split a case. It's very accurate in my Cooper. The only thing that beats it is the Lapua Midas M at $15/50 . Given I shoot the matches for fun I can't see doing that.

10-4. Carry on and good luck!

Ya know, you can come up with better data than manufacturer's BC simply by shooting two known distances and working the drop figures a little.

I never paid much attention to BC's of .22 rimfires.

I always found wind drift to be much more troublesome. Try a 3 to 5 mph breeze in the trajectory program...plays hell with groups.

Pugs .... Chrono it at the muzzle and then at 25, 50, 75 & 100 yards. There is a formula on the web (somewhere) that you can use to calculate the BC.

Good Luck with that!

Let us know what you discover.

I am coming out with .9415.

Someone can check my math.

Allen,

Thought I would help you out here and give you a chance when we shoot.

Pull the bullets on all of the cartridges, and re- insert them backwards. The flat base of the bullet, when reversed, causes a much more effective force on the targets. And you won't have to worry about BC, because it will be a really low number.

Trust me on this, but please do not reveal this secret to anyone.

Your friend,

Steve

Gotta love a helpful shooting buddy!

I've read that there are shooters trying to load .22 rimfires with black powder, looking for primed cases and such. Maybe backward bullets loaded over fine black powder would be the ultimate.

No end to what some folks try to chase in this shooting business.

Paul

Allen,
Had another good idea.

You could sight it in at say, 60yds, and then measure the actual deviation from dead on at 40,77 and 100 yds and give that data to Leupold and then they could put the correct dots or hash marks on your scope. I'm guessing this would provide greater accuracy than a computation involving BC, velocity and distance.

But I would only use this approach if reversing the bullets did not work!!

Steve

Steve,

I knew I could count on you to be as helpful as usual. Remind me to get you a couple of those energy drinks with extra caffeine before the April match. That extra movement really ups the odds on the chickens!

Allen

Folks,

I finally found an e-mail address for Winchester Ammunition, albeit their police support division, and they were nice enough to reply that the BC is .109245. So, that puts it right around many of the others.

Problem solved!

If anyone else needs info on Winchester ammo, a Bravo Zulu on customer response to;

Paul Nowak
Senior Technical Specialist
Winchester Law Enforcement Ammunition
PFNowakolin.com