Being ignorant about Garands, I made the mistake of shooting commercial loads through my M-1...They were Remington green 150 grain...

Bent the oprod... Evidently the powder they use is too slow...Probably something around the burn rate of 4350...

I replaced the oprod and now shoot either surplus military ball or reloads with nothing slower than 4064...I've read that a 150 grain bullet with 4895 is close to what the rifle was designed for..