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Shihan
07-13-07, 08:15
What will a 1/8 stabalize up to? CMMG has SPR uppers but only with the 1/8.

Thanks
Paulinski
07-13-07, 08:36
It "should" stabilise 75-77 grain bullets. Personally I went with 1/7 twist for my SPR build.

YMMV
tiger seven
07-13-07, 09:20
It will handle 75-77 grain bullets fine. It should (in theory) handle bullets even heavier, but they will probably be too long to feed from the magazine.

It's my understanding that 1/8 barrels are generally more accurate with the heavier bullets (75 grains and up) than the 1/7 barrels, and that's why they exist in the commercial market. I could be mistaken though. Wouldn't be the first time...

Derek
Bushytale
07-14-07, 03:15
The military went with 1/7 to stabilize the M856 tracer round which is considerably longer than 75/77 match bullets. A 1/8 twist will work great with 75/77 and should be a little more accurate with M193 and M855. Barrels are not all the same though and some with the same twist will act differently as to accuracy and velocity.

Billy