There is nothing wrong with the brass framed Navy revolvers. The thing you need to be careful about is not to over charge them or the frame will stretch and the revolver is then not much good. I shoot a Steel Framed 1858 New Army with the top strap. They are a little more able to with stand the charges.

If you get one, keep the charges around 25 grains and do not go more then that. They should work just fine then.