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Posted: 3/30/2006 3:41:21 AM EDT
Will a barrel with a 1:7 twist wear faster than a 1:9?
Link Posted: 3/30/2006 3:48:40 AM EDT
NO

Mike
Link Posted: 3/30/2006 3:52:50 AM EDT
So the ammo-oracle is wrong?

1:9 is best.
Why? Flexibility. It doesn't seem to have any problems throwing M856 tracers around, unless it gets really cold, it wears better than 1:7 and it stabilizes more rounds than 1:12. Additionally, 1:9 rifles, even Mil-Spec chrome chambered and barreled, can attain 1.0-2.0 MOA out to 300+ meters.
Link Posted: 3/30/2006 4:05:48 AM EDT
What round do you want your AR15 to shoot?

IF you want your rifle to shoot tight groups using the heavier weighted rounds then pick one w/ the 1/7 twist.

IF you want your rifle to shoot 55grn M193 and 62grn M855 then stick w/ a 1/9 twist.

The wear issue is a non-issue IMO and there have been plenty of threads debating this 1/7 twist wearing out quicker than the 1/9 twist....

I ain't buying into any of it and am of the opinion that the "hot-ness" of my loads/reloads will have far more to do with how many rounds I can put through the bore before it's toasted, than the twist.

YMMV,
Mike

Link Posted: 3/30/2006 4:16:25 AM EDT
[Last Edit: 3/30/2006 4:16:52 AM EDT by flavanoid]
Oh yeah, I've definitely done my research on different loadings vs twist rates, but there doesn't seem to be much evidence out there about overall wear, save for the "hotter loads = faster throat errosion" thing, which applies to all twist rates...
Link Posted: 3/30/2006 4:16:47 AM EDT

Originally Posted By flavanoid:
Will a barrel with a 1:7 twist wear faster than a 1:9?



I remember when that was the wide spread belief here 4 or 5 years ago.

I would guess throat erosion would be a bigger concern than "Barrel Wear". And throat erosion doesn't have anything to do with twist rate.

Link Posted: 3/30/2006 7:53:24 AM EDT
[Last Edit: 3/30/2006 7:54:13 AM EDT by pigmy]
Shoot the damn gun and don't worry about it. AR's are modular, you can buy more barrels, or uppers or whatever. You probably won't ever wear it out.
Link Posted: 3/30/2006 8:47:55 AM EDT

Originally Posted By pigmy:
Shoot the damn gun and don't worry about it. AR's are modular, you can buy more barrels, or uppers or whatever. You probably won't ever wear it out.



big +1


you can still find used & abused Garand rifles that shoot great
Link Posted: 3/30/2006 9:50:38 AM EDT
In my experience the 1/7 does wear out faster than the 1/9.
In my M16s I get 12-15K rounds through a 1/7 barrel before it starts to open up beyond 4 moa. 1/9 barrels, on the other hand have always lasted past 20k and one was still accurate at 25k.
My $.02,
Pat
0-1-25
Link Posted: 3/30/2006 10:13:17 AM EDT
Interesting!
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