I've got a line on one of these old guns built a while back by someone called "Curly" for what looks like a reasonable price. It's a 12 ga. trade gun style flintlock smooth bore. The hitch is I'm likely to be doing more roundball and buck n' ball than traditional shotgunning with it. Will I be risking hurting it with that kind of load on a regular basis? I don't know much about these but want to get into a flintlock gun.