I inherited my older brothers M1 match Garand. It's a Springfield reciever w/lots of Intl.Harvester parts and "BlueSky" barrel and the densest walnut stock I've ever seen (heavy!). And it's glass bedded, ect.
He had detailed notes in his loading manual and shooters log.
This gun according to him preferred 45.5gr of IMR4064 under a 168gr MatchKing. He tried Varget, IMR3031, H and IMR 4895. He also had a Rem. 700 bolt gun that preferred the IMR4064 loads; but he used H4350 for his mule deer/elk loads.
He used the same powder charge with a 125gr Sierra Spt using same bullet seater setting.
He won the rapid fire stage in the 1988 Montana state championship with the 125gr bullets shooting against a National Guard team shooting Match AR15's.
He called it his "recoiless" M1 rapid-fire load.... 10lb rifle w/reduced velocity loads to match the zero of his "long range/slow fire loads....
What a concept !!!
I still have the gun, and a bunch of ammo he loaded up in the late '80's and early '90's with match king bullets as well as some "service" gun ammo with 150gr Hornady FMJ's that he claimed were "accurate"... meaning MOA or better...
really miss my brother though !!!! a glioblastoma got him in '12