I recall an indepth artical a while back thattouted IMR 4320 as the best powder for this caliber especially with heavier loads in the 210-225gr range.Harold
Looking at the .338", 180-grain bullet specs, I see it has the same sectional density as the 150-grain .308" slug. I would consider it on the light side for bigger game, but just about perfect for deer and antelope loads.
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