Originally Posted by laynejc
I am looking to get an upper and would like some input on the barrel twist. It will be a 16" carbine upper and I have a choice of 1:7 chrome moly or 1:9 chrome moly twist ratio. This will just be a plinker. Any suggestions would be great.
as stated above, IF you can find the heavier grain bullets in the new OBAMA-era, then I would go with the faster twist 1:7. that being said, you can still shoot the lighter rounds through it, just not the real light stuff.
Or go with the 1:9 and have a decent twist rate for everything from 45gr varmint rounds up to about 75gr, and you'll be pushing it at that weight.
OR...if you can find it, compromise and get the 1:8 twist and have the best of both worlds.