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jglsprings: Yes, AA#9 is slow, among handgun powders, that is. It is the AA number commonly used for magnum loads. I have had good results with .357 and .44 magnum loads. Also, from my limited experience with microgroove Marlins, I think best results are obtained with jacketed bullets in stout loads. I think Marlin's Cowboy series guns have rifling more appropriate for cast bullets.
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