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Rimfire Firearms .22, .17 and other Rimfire Handguns and Rifles

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  #1  
Old 06-04-2017, 9:49 PM
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Default subsonic and rifling twist rate

will the common 1:16 twist rate stabilize the heavier subsonic bullets?
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Old 06-04-2017, 9:56 PM
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1:16 twist here and shooting 40gr subsonic like a champ.
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Old 06-04-2017, 10:04 PM
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1:16 twist here and shooting 40gr subsonic like a champ.
what about the heavier bullets the 60 and 80 gr ?
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Old 06-04-2017, 10:23 PM
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Originally Posted by Hunt View Post
what about the heavier bullets the 60 and 80 gr ?
Good question; I don't see anything heavier than 40gr in stores so I've yet to shoot it.

Looking online though, you can find it between .08-.10/per round. That's cheaper than Wolf Match Extra but more than CCI Mini-Mag. Order some and let us know how she shoots!
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my gun shoots better with shiny brass...plus not only does the shiny brass make me look like a pimp at the range if the sun catches it just right it blinds the guy next to me which improves my odds of winning the match.
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Old 06-05-2017, 7:26 AM
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Originally Posted by Hunt View Post
what about the heavier bullets the 60 and 80 gr?

Stabilization depends on RPM (angular momentum?). A bullet shot from a longer barrel will usually have a higher velocity and therefore a higher RPM than a bullet shot from a shorter barrel.

I am not familiar with 60 and/or 80 grain 22LR bullets. I would guess that the manufacturer of that ammo tested it with common barrel twist rates, but they may have only tested them in rifle barrels, not shorter pistol barrels.

Aguila has a 60 grain bullet. https://www.aguilaammo.com/rimfire/#Specialtab I doubt they make an 80 grain version.

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FOR WHEN ACCURACY MATTERS MOST.
Featuring a 60-grain lead bullet on a short case, the cartridge has the same overall dimensions and energy equivalent to a standard .22 long rifle round. The faster barrel twist of the projectile ensures accuracy for target shooting and small-game hunting without excessive noise. Recommended for use in barrels longer than 20".
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Old 06-05-2017, 9:34 AM
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Quote:
Originally Posted by Hunt View Post
will the common 1:16 twist rate stabilize the heavier subsonic bullets?
More than likely it will not. Heavier, and therefor longer, bullets require a faster twist. A bullet with a certain diameter and a certain weight, will have a minimum twist rate that it will need to be stabilized. As was stated by "carcassone", a higher forward velocity will result in a higher rotational velocity, and help stabilize the bullet.
This formula may help. This formula is nice because one can alter one piece of data, and watch the minimum needed rifle twist change. Upping the velocity causes the needed twist rate to slow down(higher number) and lowering the velocity causes the needed twist rate to increase(lower number).
I tried estimating the length of a 60 gr subsonic bullet for use in this formula to see if it would work in any of my rifles. Using my estimated length(.550"), and a velocity of about 950 fps, I got a needed twist rate of at least 9.9". Since most 22 lr barrels are about a 1 in 16", I felt it wouldn't work. My estimated length is actually a little short, since it doesn't take into account the rebated heel on a .22 bullet. So, the reality is, the twist rate would need to be a bit faster.

http://kwk.us/twist.html

Last edited by Sailormilan2; 06-05-2017 at 10:00 AM..
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Old 06-05-2017, 10:51 AM
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If we are talking about Aguila SSS 60rg, ammo then more Q&A recently discussed here...

http://www.calguns.net/calgunforum/s....php?t=1333404

My 10/22 needed a number of mods to cycle this stuff. Part of that exercise was installing a heavy GM 1/9 twist bbl. Rifle cycles fine. Side benefit is that the 38/40gr subsonics work real well too.

*Caveat. Some 1/16 bbls will get decent accuracy and some will tumble.
Only testing a small box of it will tell you for sure with your guns.
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Old 06-05-2017, 1:38 PM
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THANKS looking for a very quiet rattlesnake solution, I suppose the 40 gr subsonic would hit hard enough. Looks like too much trouble to set up a dedicated SS 60 gr gun.
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Old 06-05-2017, 2:11 PM
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THANKS looking for a very quiet rattlesnake solution, I suppose the 40 gr subsonic would hit hard enough. Looks like too much trouble to set up a dedicated SS 60 gr gun.
You have a shovel, rake, hoe, broom handle, etc? Quietest and most effective rattlesnake killers made.
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Old 06-05-2017, 2:41 PM
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You have a shovel, rake, hoe, broom handle, etc? Quietest and most effective rattlesnake killers made.
Yes! All of those work real well.👍
Shovel is my weapon of choice.

Infinite reloads and used to bury the leftovers too.

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