Hi, Could be 1.300/1.400 fps, mine is not standed with a 1x33" twist, most are 1-48" and or 1.60' for pr/ball. and my barrel is not that good, but ok for black powder. I made it for hunting with a bullet with a fast twis and was surprised then it shot prb ok, they don`t like a fast twist. Look at www The Muzzleloading forum in US, a heap of imfo, and they are not "old black powder rifles, can buy then brand new repos that are tack drivers. Cheers, Homebrew.357
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