22 lr penatration @ 300 yrds

I can't get it to play right now, but I think I saw this one just the other day... I was pretty impressed by it, but wow the dude had ALOT of drop to compensate for.

I don't think I'd ever shoot a .22 at something that far away unless I just really wanted to hurt it and didn't care if it died or not.

I was very impressed though, that's quite a shot! I'm a fanatic of .22's so I was happy to see someone doing a real long range test like that!

That roast looked good to me.

The test seems quite moot to me but then again, most are. For educational and entertainment purposes it ranks high.

Kind of sounds like a big advertisement for Velocitors to me.

THat and the Motorola X2 Droid.

I would like to see what it would do to a skull at that range... maybe get a pig's head from the butcher? I'd love to try it, but I don't think I could possibly make that shot with my ruger!

Shooting over cows?!

hipoint,

My ballistics program tells me that it should have about 70 ft lbs of energy left at 300 yards. I once heard somewhere that 30 ft lbs is the lowest amount needed for skull penetration, and I know that there's not many high-powered pellet rifles that reach 30 ft lbs either.

I wonder how much it throws off the accuracy when the bullet slows back down through the sound barrier? I've heard people say that that effects accuracy, but I wonder if it does very much

I wonder how much it throws off the accuracy when the bullet slows back down through the sound barrier? I've heard people say that that effects accuracy, but I wonder if it does very much

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Subsonic target loads are still the most accurate at that range. Even if they drop the most. We're talking about 40-50inches of drop at 200yds with a 50yd zero. Much more for 300yds.

It does not effect accuracy. The sound barrier is not a singular event that occurs at a certain speed but rather you perceive the event as a finite "crack" when actually it is occuring constantly when traveling above the "barrier". When the projectile is slowing down, there is not another boom.

It does not effect accuracy.

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It absolutely does affect accuracy!!!

That's pretty funny. There is no sonic boom when slowing down.

Who said anything about a sonic boom, or that it was necessary to affect accuracy? The effect going transonic has on accuracy, particularly with regards to the .22LR is well-documented. Spend any time whatsoever trying to get a .22LR to shoot well at 100 or 200yds and beyond and it becomes readily apparent. It is for this reason, regardless of 50yd results, that subsonic loads will always be more accurate at 100yds and further.

it's been said that the shockwave of that crack that is continual (as you said) catches up to the projectile as it slows down again and gives it a bit of a wobble... although, I'm just repeating what I've heard as I've never actually seen this happen.

Not that there is a barrier that it makes a boom through as it slows down, but rather the boom that follows the bullet finally catches it...

True. We are arguing different points. What I am saying is that decelerating from above the sound barrier to below has no additional effect. It is the initial compression of the waves that the projectile penetrates that has play in ballistics.

I'm sure it has at least some effect on accuracy to slow down from above to below the sound barrier I am just trying to ask how much of an effect it has. Most people talk about the range to which a round can be accurate as the range that it can go before slowing down below the sound barrier. From my very limited experience, I can't tell a difference in group size shooting cci min mags vs cci standard velocity rounds at 50 yards, but can tell a difference at 100 yards, I noticed this because people at the range (who know a lot more than I do about shooting) recommended that I switch to shooting the cci standard velocity when I started trying to shoot my .22 rifles at 100 yards because the bullet starts out sub sonic. I was just wandering if someone could give me a better idea of how big a difference it makes.

Do you mean difference as in what kind of group sizes to expect? I've been interested in that as well... I can swear I once heard that they can take a a rifle that groups half inch at 50 yards with high velocity ammo and break up the group at 100 yards to 5 inches or more. Can't say I can find that page though

I have a couple of .22 rifles that will shoot 10 shot groups under 1" at 50 yards using better high velocity ammo. With simple math, one would expect groups to be under 2" at 100 yards. However, I never get results anywhere near that. Three to 4" is more like it and that is on a dead calm day. Put a little breeze out there and the groups get even looser. I feel certain the sound barrier thing has an effect on accuracy....I watch/participate in 50 yd. benchrest now and then. I've never seen a serious competitor using high velocity ammo.

Marlin60Man said:

My ballistics program tells me that it should have about 70 ft lbs of energy left at 300 yards.

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70 ft/lbs at 300 yards? are you sure?
I just tried it in my program (but with .22WMR) and get about 37 ft/lbs at 300 yards and the WMR has a bit more power too.

I'm sure it has at least some effect on accuracy to slow down from above to below the sound barrier I am just trying to ask how much of an effect it has.

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Significant. For example, some of my rifles average .50"@50yds with high velocity and .40"@50yds with Wolf MT. Stretch that to 100yds and the high velocity groups are double those of Wolf MT. Take it to 230yds, Wolf MT groups into 4-6" and high velocity is a complete waste.

martysport,

What program are you using? I'm using Hawk's ChairGun Pro and using figures from .22LR... I thought 70 sounded a little high too, so maybe it's not calculating it accurately or something.

Edit...

Just tried the same calculations with jbm's online calculator since that's probably more accurate, and it says 53 ft lbs at 300 yards. What kind of BC are you using on your .22 WMR? I've been using .1250 for the .22LR I shoot, maybe that's too high.

I find it funny they were shooting roast beef over roast beef

.1250 is way too high 0.0597 is what I get for a CCI BLAZER (just an example) while the more powerfull WMR is shockingly less at 0.0341 for a Winchester 40g FMJ. I guess the higher speed slows down faster.

I'm getting 'about' 40 ft/lb @ 300yards for that round (CCI BLAZER) TBH 40ft/lbs doesn't sound much but would kill you.

Just out of interest I did the CCI STINGER and the BC is 0.0345. Looks like slower .22lr bullets have a better BC. Remington subsonic has a BC of 0.0829.

Hey, out of curiosity, did you calculate these BC figures yourself? I got my figures out of a chart on RFC, it would be nice to get the corrected BCs. It seems like the JBM balisitics library uses the same figures I saw on RFC though too...

sound barrier

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FYI: I think they quit calling it the sound barrier after Chuck Yeager ‘broke it’....