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Just looked in my Hornady manual and they say 46.1 grs is tops with a 178gr Bullet. 2600 fps. But different manuals say different things.
I use IMR4064 in my M-1. It was and is the most accurate powder IN MY GUN.
I can tell you the heavier bullet choice for long range is a wise one. At least in my 308 F-Class rifle. The M-1 and 308 shoot very close to the same speeds. My M-1 has never been scoped so my iron sight shooting is done out to 500 yds. Thats about as far as these ol' eyes are good for anymore.
I'll do some more research later on.
Best wishes, Bill
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