If I correctly remember Seyfried's IMR 4198 formula, I believe it's 40% of the black powder charge but check me on that, 24 grs. of IMR 4198 would be a starting charge under a 270 gr., + or - bullet. Not far off the little bit slower IMR 3031.


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NRA Patron 2007
NRA Endowment 1996
NRA Life 1988