My current favorite at the range is an Uberti Cattleman with the 1860 Army grip frame, and a .45 ACP cylinder robbed from another Uberti switch-cylinder revolver. .45 ACP in a single-action is a ton of fun and scary accurate, plus you don't have to feel guilty about the wear and tear on the expensive .45 Colt brass and don't have to fuss with moon clips, total win.