What Cayugad said... don't push it with heavy loads. I had a friend that had a brass framed 1851 Navy when we were in high school and he always had to push the limit. Well, for one thing he always had problems with it getting stiff or jamming after loading the cylinder for a second time and for another he had a terrible time breaking it down for cleaning. Another thing, his cylinder pin, being steel, eventually pulled on the threads of the brass frame it was threaded into to a point where it would not thread in as it should and he ended up having to buy another frame. Make sure you always keep the cylinder pin greased well and keep the loads light... no more than 20-22 grains, Remember, it's brass, not steel.
BPS