[QUOTE My question to you is, from a historic standpoint, how late in the century do you think the cap n balls became relics in the minds of the gun-totin' citizenry? Would they have still been in common use? ][/QUOTE]
I would think many cap & ball pistols from that era were kept until they just became unrepairable. To own a SAA Colt or a converted Remington 1858 as you may know plane and simple was beyond the reach of many. So folks made due with what they had. Depending on usage. I'm sure many cap & ball revolvers made it to the turn of the 20th century on both sides of the Mason-Dixon line.
Heartland of gun country. Fishing too.