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I'm going to suggest that N560 will be a bit "Quick" for optimum velocity with 140's in the 264 Mag.
Better powders are Retumbo, N170 & 570, H1000, Reloder 25 and Ramshot Magnum.
Regards, Eagleye.
im using 52.7gr of imr4350 2900fps from 30inch barrel shots about 2.5inchs at 500yards. i got a pound of n560 i was wounder if anyone has try it a 264wm.