Originally Posted by techiej
Get the M1 specific ammo, the CMP surplus or reload your own! I reload 30-06 and it is a heck of a lot cheaper than buying ammo.
The M-1 has a low pressure gas port near the end of the barrel. IMR4895 was specifically formulated for it. Pressure has dropped before the bullet passes the gas port.
Modern sporting ammo uses slower burning powders, more in the 4350-4831 range and pressure is still unacceptably high when the bullet passes the gas port. This will damage the op rod with continued use.
I would not use commercial hunting loads in my M-1 unless it was stated on the box that the ammo was safe for Garands.