Thats all well and good but at the end of the day your STILL defending yourself with a muzzle loading pistol against "hostiles" who have modern arms and body armour.
Dont really see what the point of the verbal tirade was since these Quentin Tarantino mexicans you describe will have much more bullets then you do
. The whole muzzle loading scenario is moot.
You could spend time, effort and finances on tooling, machinery and special moulds, or spend that money on several thousand FMJ bullets, primers and powder.
And lighten up, If your paranoid about mexicans or other illegals and are convinced the best course of action is to defend yourself with a 1858 remington revolver, accept some questioning of your logic.
Finally on a helpful note. If its only for defense, why not load some FMJ bullets and problem solved? With all the kirst converter cylinders out there I imagine firing a FMJ round through a Cap n ball has been done. Might be something to look into, although your cylinder chambers may need to be bored out. Another option is having a conical bullet mould machined that will accept a copper core and have the lead cast around it, Im not sure what the legalities are on this since you could easily substitute a steel or tungsten core........... But a job like this could be easily done by any one of the custom bullet mould manufactures. You DO know conicals can be shot out of a Cap and Ball do you not?