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Old 12-22-2011, 12:16 AM   #11
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1978,

The 1:9 twist will shoot from 55 gr -69gr. bullets fair! But the 69gr.-72gr. is on the high side of good stability in flight for the 1:9 twist rate. This due to the fact when you get up to the 72 + grain bullet range actually you need to go to a faster twist like 1:7 to stabilize them effectively for max accuracy. Although the 1:9 twist will shoot the 55 gr. bullets very well, most will find that around the 62 gr. bullet weight you have mention seems to produce max accuracy in the 1:9. And if you are reloading, powder volume in the mid range is usually best for peak accuracy. But I will remind you, that every rifle has it's own personality if you please and there will always be a rifle that is an exception to the rule. I have a friend that has a Rock River A-4 20" Varmint Rifle in 1:8 twist. Would logically we think that it would be a tac driver with 42 or 45? grain specialty varmint bullets? NOT! But it does and is a tac driver. Should it/ NO!

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Old 12-22-2011, 12:50 AM   #12
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Here you go this should help you



Twist Rates
The .223 Rem shoots a wide range of bullets very effectively, from 35gr flat-based varmint bullets, to ultra-long 90gr VLDs. However, you'll need the right twist rate for your choice of bullet. For max velocity and accuracy with the lightest bullets, a 1:14" twist may be ideal. More versatile is a 1:12" twist that will allow you to shoot the popular 60-64 grain match bullets. (However, a 1:9" twist is needed for the steel-core 62gr bullet used in the M855 military loads, because that bullet is as long as most 70-grainers.) For normal lead-core jacketed bullets, a 1:9" twist will let you shoot up to 73gr bullets. Since most .223 Rem shooters prefer bullets in the 50-73gr range, a good "do-it-all" solution is a 9-twist, unless you're a Highpower competitor.

For long-range match purposes, long, high-BC bullets are favored for their ability to buck the wind. You'll want at least a 1:8" twist to shoot the 77gr and 80gr MatchKings and 80gr Bergers. To shoot the new 90gr pills, a 1:6.5" is recommended, though a true 1:7" will work in most conditions.

Overall, what twist rate is best? For varminting we like a 12-twist. The slower twist will give you a bit more velocity, and minimize the risk of jacket failure at high rpms. For general use, an 8-twist barrel will let you shoot the excellent 77gr and 80gr Sierra MatchKings and nearly all varieties of non-tracer milsurp ammo. We'd only select a 1:7" or faster twist barrel if we had a need to shoot the 90gr VLDs.

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Old 12-22-2011, 01:39 AM   #13
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Quote:
Originally Posted by Sniper03 View Post
1978,

The 1:9 twist will shoot from 55 gr -69gr. bullets fair! But the 69gr.-72gr. is on the high side of good stability in flight for the 1:9 twist rate. This due to the fact when you get up to the 72 + grain bullet range actually you need to go to a faster twist like 1:7 to stabilize them effectively for max accuracy. Although the 1:9 twist will shoot the 55 gr. bullets very well, most will find that around the 62 gr. bullet weight you have mention seems to produce max accuracy in the 1:9. And if you are reloading, powder volume in the mid range is usually best for peak accuracy. But I will remind you, that every rifle has it's own personality if you please and there will always be a rifle that is an exception to the rule. I have a friend that has a Rock River A-4 20" Varmint Rifle in 1:8 twist. Would logically we think that it would be a tac driver with 42 or 45? grain specialty varmint bullets? NOT! But it does and is a tac driver. Should it/ NO! 03
My 1:12 bolt shoots the 45 grn 1/2 MOA if I do my part. 1:8 is more for 65+ grn. I mostly load 55 grn so I can shoot them in my bolt and 1:9 AR. I use Varget but have also used H335 with good results.
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Old 12-22-2011, 02:21 AM   #14
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Thanks for all the advice everyone. I think I am going to start with some 55gr I think I have some Varget and some h335 laying around. I will try some test batches increasing by .5gr up to the max load and see what kind of groups I get. I may try some 62gr and 69gr later on.

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