From what I have read the cowboy action guys have tuned their revolvers to work with a tight fitting #10, and a heavy enough mainspring to keep the hammer down on the fired cap and contain it, using loads just heavy enough to get the ball to the target without blowing the caps to pieces. This when shooting against the clock when everything has to cycle. For general use, a bit of attention to where the fired cap is dropping when cocking is sufficient to keep them out of the lock work. One thing that occurs to you is that folks like JB Hickok, Wes Hardin and other shootists back in the day who used the cap and ball for serious defense, must of had to remember to work the guns rather slowly and carefully, but in a hurry while being fired upon. How was a fellow supposed to remember all of that in the heat of the moment? Things have not changed though and sure as shooting, if you panicked and hurried things you could wind up with a couple of useless pistols.