H4831 has been the goto powder for the 270 since the days it was sold in brown paper bags for a buck to buck fifty a pound, a little less if you bought a 5lb bag. As a kid I remember the bags were marked with black crayon, magic markers weren't invented yet.
Some use IMR or H4350 with good results.
Bullets? 130s are pretty much the first choice but some prefer a 150. Dad was the exception, he liked the 170 RNs, Speer IIRC.
With the "New" H4831/H4831SC I start at 58-58.5 grains with a 130 and go from there.
Bill
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