Around 39g of IMR 4064 is magic with a fed 210
I have shot many thousands of rounds with Win 760, H414, and my favorite now is the AA2700 as it has one of the lowest heat indexes of any powder made which equates to long barrel life, unlike Varget and IMR 4064.
My brother shoots H4350 with a 9 1/2 primer, consult Nosler's most accurate load.