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October 31st, 2008, 07:08 AM #1
Preferred bullet weight for 1:9 twist in .223?
I have an AR with a 16" bull barrel with a 1:9 twist. What bullet weight should I choose to work up a load with for accuracy at 100 and 200 yards? Or maybe, what weight range seems to work best with this twist rate?
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October 31st, 2008, 07:39 AM #2
Re: Preferred bullet weight for 1:9 twist in .223?
Bullet-to-twist has a few factors.. Bullet length, velocity, and diameter. Since we know the diameter, what velocity range do you plan/expect to be in?
2600-2700fps
2700-2800
2800-2900
2900-3000
3000-3100
3100-3200
3200-3300
3300-3400Last edited by knight0334; October 31st, 2008 at 07:41 AM.
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October 31st, 2008, 07:45 AM #3
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October 31st, 2008, 07:58 AM #4
Re: Preferred bullet weight for 1:9 twist in .223?
A 1:9 twist will handle up to a 62gr bullet. You might get lucky and find that it also handles a heavier bullet, but not definite.
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October 31st, 2008, 08:43 AM #5
Re: Preferred bullet weight for 1:9 twist in .223?
From my experience, what Steve posted above is accurate. ...about 62gr at its upper mid level to highest velocities.
The faster you push a given bullet, the less twist rate you need. With the same bullet at lower speeds you need a faster rate. Longer bullets need more twist than shorter bullets.
50-62gr is probably your operating window given typical velocities for those bullet weights. I personally would start with 55gr slugs.
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October 31st, 2008, 09:05 AM #6
Re: Preferred bullet weight for 1:9 twist in .223?
Are you shooting from a bench? Are you using iron sights or a scope? How accurate do you want your rifle to be? Can you shoot as well as your rifle can?
It's been my experience that 55gn or 62 gn performs virtually the same at 100-200 yards.
May I recommend a beginning formula for you? H335 24.5 gns, your brass (LC ideally), 55 gn fmjbt (any good quality heads).Last edited by Hawk; October 31st, 2008 at 09:08 AM.
Toujours prêt
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October 31st, 2008, 01:14 PM #7
Re: Preferred bullet weight for 1:9 twist in .223?
My 20" 1:9 HBAR likes anything up to 69gr SMK's over the right powder charge. I have had pretty good luck with H335 with that projectile. Just loaded up 100 over Varget over various charge weights and expect some good results. Ran a batch of Hornady 55gr FMJBT's over H335 and achieved maybe 1.5" -2" groups at 100 yards, but I think I can tighten that up by fooling around with the charge. All of which were loaded in LC brass with CCI primers. I am finding out very quickly that the often used reloading term "voodoo" really does come into play in finding the right load for you particular rifle.
The Capn'
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