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- - Barrel twist. I know a someone explained this to me but I forgot. (http://goldismoney.info/forums/showthread.php?t=358237)

Dave Thomas | 03-13-2009 08:37 PM
Barrel twist. I know a someone explained this to me but I forgot. Okay, so I remember someone telling me that a slower barrel twist meant I could stabilize a heavier bullet. If I have a .22-250 barrel, at a twist of 1 in 12. Can I push 60+ grain bullets through this thing? Or will I have to stick at 55 gr and below? From what I've seen out there the quicker barrel twists on ARs are the ones that can stabilize the heavier bullets.

AurumAg | 03-13-2009 11:51 PM
Re: Barrel twist. I know a someone explained this to me but I forgot. The Ammo Oracle Knows All!

SilverCity | 03-14-2009 12:15 AM
Re: Barrel twist. I know a someone explained this to me but I forgot. Quote:
Originally Posted by Dave Thomas (Post 1624349) Okay, so I remember someone telling me that a slower barrel twist meant I could stabilize a heavier bullet. If I have a .22-250 barrel, at a twist of 1 in 12. Can I push 60+ grain bullets through this thing? Or will I have to stick at 55 gr and below? From what I've seen out there the quicker barrel twists on ARs are the ones that can stabilize the heavier bullets.
The latter is true...faster twist for heavier bullets For 22-250, 1:12-1:14" twist generally stabilzes .224 bullets in the 40gr to ~60gr range. For .223, 1:12 twist for 45-60gr, 1:9 twist for 50gr to ~70gr, 1:7" to 1:8" twist stabilizes 55gr to 80gr--and even 100gr loads (being developed).

electric-amish | 03-14-2009 12:28 AM
Re: Barrel twist. I know a someone explained this to me but I forgot. Hey Silver City, Where can I find out about 1 in 10 Savage 308. It there a chart somewhere? Just trying to cut some time out of the trial and error method. E-A

SilverCity | 03-14-2009 01:28 AM
Re: Barrel twist. I know a someone explained this to me but I forgot. Quote:
Originally Posted by electric-amish (Post 1624629) Hey Silver City, Where can I find out about 1 in 10 Savage 308. It there a chart somewhere? Just trying to cut some time out of the trial and error method. E-A
308 runs 1:10 or 1:12. Generally speaking most bullet weights should shoot okay in either twist, but the 1:10 should shoot heavier bullet weights 150-200gr a bit better, and the 1:12 twist 110-165gr. YMMV. My choice for optimum accuracy in a 1:10 barrel? Try Federal 168 or 175 Match...or handloads with the same Sierra bullets and IMR3031 or IMR4895 powder.

TomD | 03-14-2009 07:02 AM
Re: Barrel twist. I know a someone explained this to me but I forgot. Quote:
Originally Posted by Dave Thomas (Post 1624349) Okay, so I remember someone telling me that a slower barrel twist meant I could stabilize a heavier bullet. If I have a .22-250 barrel, at a twist of 1 in 12. Can I push 60+ grain bullets through this thing? Or will I have to stick at 55 gr and below? From what I've seen out there the quicker barrel twists on ARs are the ones that can stabilize the heavier bullets.
An easy way to envision what is going on with twist and bullets is to consider bullets to be tops. A very short fat top can be stabilized with very little twist but you're going to have to spin the devil out of a long and thin top to keep it up.

Dave Thomas | 03-14-2009 01:48 PM
Re: Barrel twist. I know a someone explained this to me but I forgot. Thanks fellas, I got it in my head somehow that spinning a heavy bullet really fast like 1:8" would just have the jacket fly off and things like that.

hypervel | 03-14-2009 03:14 PM
Re: Barrel twist. I know a someone explained this to me but I forgot. And don't forget the speed factor. Heavy and slow can stabilize in a fast and light twist barrel....for the casters out there....

TomD | 03-14-2009 04:21 PM
Re: Barrel twist. I know a someone explained this to me but I forgot. Quote:
Originally Posted by Dave Thomas (Post 1625199) Thanks fellas, I got it in my head somehow that spinning a heavy bullet really fast like 1:8" would just have the jacket fly off and things like that.
That has happened but only with very lightly constructed varmint bullets in rapid twist barrels pushed fast. How about a 22-250 at 3750 fps in an 8 twist, that is 337,500 RPM, that'll blow a Chevvy up! Seriously, if you don't shoot bullets so lightly constructed that they will expand in a prairie dog, it isn't an issue.

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