Quoted: I would not shoot any loads heavier than a commercial 150 SP load. If handloads use 150 grain bullets with Hodgon or IMR 4895 powder, or, a powder with an equivalent burning rate. Heavier bullets than 150 grains and slower burning powders increase the chances of bending your op rod.
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Who told you that crap? You can shoot loads heavier then 150 grs is an M1 without fear or damaging your rifle. For example, AP ammo, used almost exclusively in combat in WWII and Korea, used 163 gr bullets. Match ammo used a 173 gr bullet. Anyone who shoots the garand in matches use 168 or 155 gr bullets, depending on conditions they shoot in and what their rifle likes.
All you have to do is stay with a bullet under 180 grs and powder no slower then IMR 4064 and you'll be fine. Any commerical ammo suitable for hunting is most likely unsafe to fire even if it has a bullet of 150 grs.
Just buy a ajustable gas plug then you can vent the excess gases and you don;t have to worry about all this.