I said to self, bullet prices keep going up, I have lots of lead, load your M1 ammo with CB's! well I loaded three loads, one was a LEE 160g with GC, then a 180g with GC from Lyman, and a 150 with GC from Lyman. I used IMR 4895 because it is a M! started with 40g and worked up the 160 worked great at 44, the 180 were at 42.7 and the 150 were best at 45. No problems with cycling and of course no leading (should be no lead if cast right,and sized right) used 50/50 BW/LLA, LLA, and teflon tape. all seemed about as good as the other, saw no difference.
So you who are getting CMP Garands do not be afraid to use CB's or you will miss half the fun (working up loads) I would stay with the recomended powder types, have tried slow WC872 with fair results but not as good as 4895.