The '71-72 Opentops, Richards-Mason conversions, and Type II Richards conversions are all available in .38 Spcl, .44 Colt, .44 Spcl, and .45 Colt. None are available in 44-40. Only Remington conversions are available in 44-40. These are all made by Uberti. Taylors only carries these guns in .38 and .45 but Cimarron carries them in .44 as well. I'm not sure what calibers are available in Stoeger-branded guns. If you buy a percussion gun and a conversion cylinder and "do-it-yourself" then .38 and .45 are available, with some issues to consider that I won't go into.
Cracks at the thin spot at the rear of some .44 and .45 barrels are not the big problem you might expect from reports on the wonderful internet, and those were mostly earlier guns. I spoke with Cimarron's gunsmith recently and he has seen very few of these in the last year or two. I would, nevertheless, suggest using only mild loads in a .45.
BTW, " 'cause they look cool " is a perfectly good reason for buying a gun
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