Powder
In regards to a powder choice in an M1 chambered for .308 or even 30-06 I have have VERY good results in accuracy with IMR-4895.
It was the original powder for M2 Ball ammo and continues to be MY first choice. I have used 4064 with great success as well, AA 2520, Win 748, BL-C2, are also good choices.
When there is something that has proven itself for so long, I tend to stay with it rather than re-inventing things, but that is just ME!
Randy
PS.
When I shot NRA Service rifle with an M1A, the load that replicated Lake City M-852 was a match casing, Federal primer, 42 grains of IMR 4895 and a Sierra 168 Match King. Point of Aim and Point of Impact were that same.
We always maintained that if your rifle did NOT shoot this load your rifle was NOT going to shoot well with anything else.
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