Welcome aboard, Deadstroke, the answer to your question is very little. For more specifics there are several threads dealing with ammo differences. I know you will enjoy the forums and being here with us, have fun.
Welcome aboard Deadstroke. I'ts always nice to add a new member,especially when thier from the great state of Texas. My M1A eats a steady diet of both 7.62x51, and .308 with out so much as a burb. Good luck to ya--nick
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