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Posted: 1/9/2005 8:39:35 PM EDT
[#1]
It means the rifling is cut so it takes 9 inches for the bullet to make one complete revolution. The bullet will come out of a 1 in 9 twist barrel faster than a 1 in 12, and slowwer than a 1 in 7. The heavier the bullet, the slower it moves, so heavier bullets need a faster twist rate. But if you use lighter bullets, a too fast twist rate can also degrade accuracy and cause the bullets to disintegrate. 1 in 9 is fine unless you're going to be shooting unusually heavy bullets.
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Posted: 1/9/2005 8:45:20 PM EDT
[#2]
Ah, why thank you. I was kinda thinking that, but wasnt quite sure. I couldnt find anything on this on the internet, so I thought I would try here. Thanks again.
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Posted: 1/9/2005 8:45:55 PM EDT
[#3]
faster than a 1:12, slower than a 1:7. Glad I could help.
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Posted: 1/9/2005 8:54:30 PM EDT
[#4]
John,
Is there any problems using 55 to 77 grain bullets in a 16" barrel with a 1:9 twist? Will the heavier-grained bullets be less stable out of the shorter barrel? Thanks, HH |
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Posted: 1/9/2005 8:57:11 PM EDT
[#5]
1:9 will shoot just about anything.
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Posted: 1/9/2005 9:02:28 PM EDT
[#6]
Thanks, LW!
HH |
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Posted: 1/9/2005 9:02:57 PM EDT
[#7]
Sorry, my knowledge is a bit more general than that. I know you won't have any trouble with 55 or 62 grain bullets with a 16 inch 1-in-9 twist barrel, and I think you should be okay with the 77 grain bullets, but I'd ask someone with greater expertise. |
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Posted: 1/9/2005 9:07:36 PM EDT
[#8]
Thanks, John...appreciate your help!
HH |
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Posted: 1/9/2005 9:15:58 PM EDT
[#9]
I'm a newbie so I don't know shiat... just to get that out of the way. My understanding is that for anyting OVER 55gr, a 1 in 7 twist is better (meaning more accurate and stable in flight). In fact a 1/7 twist is better for grains up to 77, according to the US Special Forces in Iraq. 1/9 is best for 55gr and under. |
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Posted: 1/9/2005 9:34:58 PM EDT
[#10]
If you are mainly shooting 69-77 grainers I would highly recommend a 1 in 7 but if you stay with the 55-69 grainers keep the 1 in 9. That's my .02 anyway. ETA: The barrel length won't effect stability as much as twist rate with heavier bullets. Lots of 14.5" M4's shooting the heavier bullets. |
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Posted: 1/9/2005 9:59:53 PM EDT
[#11]
Thanks, niceguy and I_H_R,
I'm sure now I'll stick to the smaller stuff. I appreciate you guys sharing your knowledge! HH |
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Posted: 1/10/2005 6:30:54 AM EDT
[#12]
Wayne1411 and HoustonHusker, if you haven't read the Ammo Oracle, you should. It contains a lot of useful information regarding .223/5.56 ammunition, including several sections on twist rates and their effects.
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Posted: 1/10/2005 5:43:03 PM EDT
[#13]
The 62 grain SS109 bullet was origianl meant to be used in a 1/9 twist barrel. Bullets longer than this have poor accuracy in many 1/9 twist barrels... especially in cold weather and short barrels.
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Posted: 1/10/2005 6:10:14 PM EDT
[#14]
why thank you sir.
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Posted: 1/10/2005 6:29:24 PM EDT
[#15]
Thanks, 77 and DevL!
HH |
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