Well actually I doubt it was such a big problem. When I started shooting Colt revolvers, my first one was an 1851 Navy made in Hartford Ct. back before replicas were being imported. The corrosive caps we used were made of thicker copper and I do not remember being pestered by cap jams. Of course the nipples were the origional ones that came in the guns. Essentially I was shooting an 1851 Navy loaded like J.B. Hickok but not with his skill.I do not mean to demean, or start a discussion, but if you are going to use modern methods to avoid a problem of yesteryear, just get a Konverter and shoot 38's.
A man did not know how to shoulder a Hawken correctly so he put the muzzleloader in a modern rifle stock, The online craze began.