Re: Reloading data for hunting and Comp for M1A
I believe it might be the Nosler book which has a separate section for M14 types.
Shop around until you find one that does.
My numbers from QuickLOAD indicate that, contrary to some other opinions, Varget is not too slow for the M14 gas system, so long as you keep velocities of 175s below 2650 (or was it 2600? 4064 shoots 'em tighter for me and with lower ES and sd, so I pretty much quit trying with Varget a few months ago).
RE-15 can safely work, too.
With both, the limiting factor is not the chamber pressure, but the port pressure (max spec is 14,500 psi). The end result in about 100 fps slower than a chamber-pressure safe load for a bolt gun, and predicted pressures in the mid 50,000s rather than being on the ragged edge of 60K.
My op rod speeds and resulting ejection pattern are consistent with these predictions.