For punching paper at 100 you don’t really need or necessarily want a full horsepower load.
My favorite and most accurate M1A load was soft shooting 39.5gn of H4895 and 155 AMAXs. Less recoil to manage and that contributes to consistency and accuracy.
I will say that 1/2 MOA 5 shot groups is setting the bar high for an M1A pattern rifle. 3/4 was the best I could wring out of mine.
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