Lefty7mmstw
Well-Known Member
Bad powder for a cavern like that--I'd go rl25, rl50, or retumbo. I've used I 5010 and it was good. I've gone to 109 grains with the 7rum with the right powder. Sub 70% fill with 4831 doesn't sit well with not eating a bolt; I'm surprised hodgdon is showing the load. Sierra won't even show data for the 7rum because faster powders were setting lugs back.Not really, don't care as much about velocity as I've already stated. Your rum is perfectly safe from my rem mag. Not trying to compete. I just looked at the hodgdon sight for the published data on 160gn that 3050 is the max. 160 GR. NOS PART
IMR IMR 4831 .284" 3.600" 76.5 3050 61,000 PSI