Been reloading for years but never for semi auto rifles, Do you need a small base die for the M1 garand & AR. I also hear that cci mil spec primers (WHITE BOX) should be used. If none on hand what primers should you stay away from. I know that the M1 needs med Burn rate powder at 2700 fps or so, have some data for this one. Mostly looking at primers to prevent slamfires & reliability of feeding etc