Actually, I just got done running about 400 rounds through my Garand over the weekend... mostly test loads.
My standard load forever has been 47grn IMR4895 under any 150'ish grn bullet... easy shooting that doesn't beat the rifle. 168grn BTHP's get 46grn IMR4895.
I tested 44.5grn H335 as an alternate, with 150grn bullets, and while it was accurate, the primers were mashed pretty flat. I'll probably drop down to 44grn and try it again. I also tried 47grn IMR4064 with reasonable results. I'm trying to drop IMR4895 from the bench... the M1 is the only load I use it with anymore, but it's proving to be the best powder for the M1, all things considered... I never have pressure issues with it, it's reliable in the gun, and produces good accuracy.
It was interesting... using identical charges of IMR4895 and IMR4064 under a 150grn Winchester FMJ bullet... I found they produced almost the exact same velocity (2660fps and 2650fps, respectively) but the IMR4064 load generated more pressure (based on the condition of the primer.) I have a friend with QuickLoad software, I'm going to have him run it through and see what it says. As much as I want to leave IMR4895 behind, it looks like it really is the best powder choice... meaning IMR, H, or AA's powders in that burn range.
I tell all new loaders to throw the Hornady garand data away.. get regular 30.06 data and use the CORRECT powders for the garand which are any from 3031 to varget/H380. Pick a bullet weight between 110-220 and enjoy.
I don't consider that very good advise. The Garand (service rifle) data is specifically for target ammos for the Garand, and is very good data
for what it is intended for. If you want to hunt or get additional performance from the Garand, that's something completely different. Grabbing a 220grn bullet and stuffing it on top of a max charge of Varget or H380 will very likely break something, eventually. My advise is... if you want to use a bullet outside of the generic FMJ or BTHP bullets in the Garand, or particularly heavy bullets, start low and work up... with the understanding that keeping your loads on the lower side of pressures is better for the rifle. If you really want to use heavy bullets in the .30-06, I would say find a more suitable firearm.
There is a reason the data providers go through the trouble and expense to generate Service Rifle data... and that includes the M1, the M1a, and the AR platforms.