I load all kinds of bullets in my Garand, 130s to 180, AND cast bullets. FMJ, SP, HPs, etc.
I haven't had any problems with any of them. The only exception is most of my cast bullets I load too light to work the action.
That doesn't matter to me since I use them for off hand practice and in the matches I shoot with the Garand, you single load in off hand anyway.
Powder is more critical. Don't load slow burning powder. Something along the med. burning rates of 4895, 4064, Var., R-15.
4895 was designed for the Garand and I've found it works best in my rifles. 4895 is also a good powder for reduced loads.
Don't load for velocity, load for accuracy. For hunting a 150 - 165 gr bullet loaded to 2700 fps will take care of any game out there. I've found that in the Garand, velocities between 260-2700 fps work best.