I recently bought a 50-70 Trapdoor and like it, but there is one issue that is bugging me. One area of the chamber has some pitting in it, and it's preventing the brass from fully ejecting. It will extract about 1/4", at which point you can usually pull the case out. Occasionally, you might have to use a pocket knife to get under the rim and give it a little help. The pits are deep enough that you couldn't just polish them out, but I don't feel the pitting is unsafe, especially in a low pressure gun like this (I ONLY shoot holy black in it), but it's definitely annoying. The professional way to fix this probably be to have the chamber sleeved, but that's expensive and I wouldn't feel right about having a historic gun like that modified to that extent.
After some research, I think I found a solution, but I wanted to run it by you guys first. Could I just fill the pits with JB weld?
Here's the process I was thinking of doing.
1) Kill and remove any corrosion left in the pits by plugging the barrel and filling the chamber with Evaporust and letting it soak overnight.
2) Clean and decrease the heck out of the chamber with brake cleaner
3) Apply a layer of JB Weld to the pitted area.
4) Insert a fired case that has been either waxed, or sprayed with mold release into the chamber and let sit overnight.
5) Give the chamber a light polishing.
Am I wrong to think that this would work?