I had an 1851 Colt replica that I hated. I spent more time cleaning it than shooting it due to its brass frame. Go with a steel frame for sure. The issue of multiple rounds firing at once is called "chain firing" and I had that happen twice. It's scary. Crisco will help, but chain firing is a risk anytime with smoke wagons. I agree with the idea of buying a convertible so you can fire cartridges later, but consider ammo cost when factoring this in. .45 long colt rounds are not cheap, and the .36 BP conversion allows for firing the cheaper .38 rounds.