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by A-R
Tue Sep 18, 2012 8:05 am
Forum: Rifles & Shotguns
Topic: Want to learn more about AR rifles.
Replies: 10
Views: 3407

Re: Want to learn more about AR rifles.

5.56mm (~ .223 caliber) is most widely chambered as its what the US Military and NATO uses

I turn in 7 inches (1/7) is "faster twist rate" than 1/9 and better stabilizes heavier bullets (worse with lighter bullets)

Both should do fine with common 55-grain FMJ. 1/7 does better at upper end of 5.56mm bullet weight (69- to 77-grain) 1/9 does better with the little "varmint" rounds ~ 40 grain and well with 62 grain and "acceptable" (depending on variables) up to about 69 grain

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