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Posted: 7/9/2002 11:13:36 AM EDT
[#1]
If those are the ammo you're going to shoot, I'd get the 1:10. It will stabilize anything up to about 69 grain bullets, and perhaps 75's (maybe). For factory 55's and 62's, 1:10 is ideal.
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Posted: 7/9/2002 11:24:52 AM EDT
[#2]
1:9 is the lowest for the range of lengths of .223bullets in the 55 to 62 grain weight range. As the Bee Keeper said, 1:10 is optimal for bullets with lengths in those weight ranges.
Noah |
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Posted: 7/9/2002 11:52:02 AM EDT
[#3]
I know that the 1:10 will stabilise bullet up to 69gr , but i have also read that the ss109 heve the same lenght that a 71 grs lead core bullet !
Does the short barrel of the 551 require a faster twist ? |
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Posted: 7/9/2002 12:06:04 PM EDT
[#4]
In the AR, the optimum barrel twist for the 55 grn bullet is 1:12.
On the other hand the optimum bullet is 62 grn for a 1:9. |
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Posted: 7/9/2002 2:20:22 PM EDT
[#5]
Barrel length has no influence on the stabilization of a bullet. |
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Posted: 7/9/2002 6:18:02 PM EDT
[#6]
I'm curious where you got your info? |
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Posted: 7/9/2002 6:46:19 PM EDT
[#7]
I always use 1/9 because it will stablize and shoot accuratly the 62gr. SS109 such as C77 or M885 and it will also give excellent accuracy with the cheaper 55gr. bullets.
1/7 is the twist rate nessecary to stablize the governments tracer round. It is very long and thus require a 1/7 twist to stablize. You don't need the faster 1/7 twist, unless you will be shooting very heavy match ammo like the 75gr. stuff. |
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