My father bought a 36 Navy Colt back in the 50's.

The owner, a older lady in Redding Calif., had no more use for it and let my
father buy it from her. He asked if it was in good working condition, at
which the lady replied........

"Yes it is. I shot a 90 pound black tail, from off my porch, just last year".

Black powder works but a lot of care must be used with the "Real" stuff.