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Old 02-24-2012, 04:20 PM   #31
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Do not shoot military 5.56x45 in your 223. You can have the chamber redone by a gunsmith to handle the NATO round.
yeah I know thats a no no , its only .223 ammo for it . I couldnt handle waiting til 1 for lunch and Im less than 1 mile from work and since Im my own boss I went home to check and it says nothing on it anywhere , gun , box , paperwork . So it looks like I have been eating my own words for the last 5 months on it saying its a 1:12 , it must be a 1:9 if thats what savage is saying it is, which is perfect , I would rather shoot a little heavier round for longer distances/ knockdown anyway. Now WTH and I going to do with the 700+ rnds of ammo I have . HMMMM send them down range of course

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Old 02-26-2012, 03:50 PM   #32
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I have a Cooper M21 Custom Classic in 223 Rem. I bought it in 2008, but it could have been made earlier. The point is that it has a twist rate of 1:14. Until recently, most factory 223's had a 1:14 twist. Now almost all, including the Coopers, have a twist of 1:12.

Here is twist info from an article on the 6mmbr.com web site regarding the 223 Remington. It lists the maximum bullet weight versus twist rate:

1:14 - 55 gr, 1:12 - 65 gr, 1:9 - 73 gr, 1:8 - 80 gr, 1:7 - 90 gr

For more info, here is the URL for the 223 Remington:

http://www.6mmbr.com/223Rem.html

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Old 02-26-2012, 04:15 PM   #33
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I have a Cooper M21 Custom Classic in 223 Rem. I bought it in 2008, but it could have been made earlier. The point is that it has a twist rate of 1:14. Until recently, most factory 223's had a 1:14 twist. Now almost all, including the Coopers, have a twist of 1:12.

Here is twist info from an article on the 6mmbr.com web site regarding the 223 Remington. It lists the maximum bullet weight versus twist rate:

1:14 - 55 gr, 1:12 - 65 gr, 1:9 - 73 gr, 1:8 - 80 gr, 1:7 - 90 gr

For more info, here is the URL for the 223 Remington:

http://www.6mmbr.com/223Rem.html

Oldtymer
While it may be the max weight it will shoot, it is not the max weight it will shoot accurately. My 1:12 CZ opens up to 1 moa with 55 grn but is .5 moa with 45 grn. I would estimate they need to take 10 grains off those weights. I have tried 5 different loads with each of 2 different powders and 3 different 55 grn bullets and the best I have gotten is .85 moa. While that is not bad, I am looking at clover leafs with 45 grn. The Savage 1:9 shoots .5 moa with my 55 grn hand loads.
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Old 02-26-2012, 05:37 PM   #34
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You can use the twist rate as a guide,but only by shooting different bullets will tell you what your rifle likes to shoot.
My 1-9 twist Savage 12 shoots 75gr Hornady Moly Match bullets 1/4-1/2 moa,but it shoots a 75gr AMax around 1 1/2 moa.The AMax is a longer bullet,and doesn't stabilize very good with a 1-9 twist.
Just because a bullet is a certain weight doesn't mean it's the same as others.
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Old 02-27-2012, 07:18 PM   #35
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JTJ/Txhillbilly,

You’re both correct about the bullet length. I found a formula at this web site which discusses Twist Rate:

http://www.loadammo.com/Topics/July01.htm

The bullet length is used in the formula, but not the bullet weight. As you both mention, the only way to know for sure is to test them at the bench.

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