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For the roar just use the heavst bullet you can find
Cast from pure lead if you feel inclined you could drill a hole into the Center of the nose of each bullet to make a hollow point
Load to...

Im running a 420gn lyman .459 bore is .458 and lee 405gn hollow base .459
In my microgrove
Both bullets made from pure lead
55gn by volume of 2f swiss black powder for playing 65by volume for...

I shoot an h&r spring feild trapdoor copy but they have a marlin micro grove barrel shoots cast bullets fine at least to 450 most I’ve shot it to so far

What size bullet dose it shoot 45 .458?