This is a 1931 Colt OP in 32/20. shot a 1 5/8" six shot group using 115 gr gas check bullet with a substantial amount of 1680. Plain base with mild titegroup loads go abour 2". Had to do some work on the bold and clean out the sludge, but after that all is well...did the same with my Colt Marshall and it shoots well too (1955).
