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Checke the 1884 and it does have a 1-22 twist also. Slogged 'em both and they are a little oversize, it is very difficult to get and accurate measurement with 3 groove rifling but determined that both barrel have a .460 groove dia. The lands are much harder to measure but by comparing bullet fit at the muzzle, a .449 bullet slips in easily, with room to spare. I would say they are both at least few thousands over .450....Ed |