re: Ruger American Rifle 308win

quote:

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Yes. If you have a 308 Winchester chamber, 7.62x51 is safe to shoot.

It's actually the opposite of the 5.56/.223 thing.

5.56 <- 223 ok
.223 <- 5.56 not ok

and

.308 <- 7.62 ok
7.62 <- 308 not ok

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That's not entirely correct. People will cite the Go/No Go gauge spec differences and case dimensions as why .308 commercial loads are not safe in mil surp 7.62 rifles. The real reason is more akin to why you shouldn't run most commercial .30-06 ammo in a milsurp M1 Garand. It's not the chamber, brass, or pressure as much as the burn rate which affect gas operated semi-autos.