I have been looking at the Cowboy guns, Single Action clones of the 1873 Colt. I found one here local in .45 Colt and was able to trade a Ruger revolver that we have not used in years for in. I have already had it out to the range and it was fun, though I really need more practice!
It is a Ruger New Vaquero, 4 3/4″ barrel …. and .45 Colt
Note the size of the .45 Colt rounds to a .38 Special