Google NRA recommended handloads for the M1 Garand.
BTW; I used 51.2 grains of this IMR 4064 powder under a 150 grain bullet, many times in the past with my own M1 with considerable success.
But I did use the CCI #34 primer instead. And if you want a finer sight picture on distant targets, by yourself a 0.062 thou' front blade match post.
If you choose to shoot iron sights beyond 300 meters, you will not regret this additional purchase IMHO.
Good shooting friend..........