Re 1851 revolver
Brass frame revolvers can be bought quite cheaply. used ones can be had for around $125.00. Do not however buy one!. If you do a fair amount of shooting, the frame will stretch, and they are not worth repairing. Stick with a steel frame gun. An Uberti would be my first choice or a Pietta, second choice. The Uberti will cost you a little more than the Pietta, but they are worth it. Of the thirteen Uberti cap and ball revolvers i own, my 1851 Navys are my favourite. They hold and point naturally, the size of the grips fit your hand just right. I use mine for Cowboy Action shooting. I have opened up the rear sight, and made them real tack drivers.
Pete