My dad and I "worked" on a couple of muzzle loaders that wouldn't fire. It wasn't hard to figure out that the nipple assemblies were clogged. The old man had some small round files (I believe they are for cleaning carbs). Cleaned them out that way. Everything worked the next shot. I have never had a cap fail to fire.
There's a good chance that if they came as a set on a sort of holder that they are welding torch tip cleaning reamers.
Even if they aren't I'd suggest hitting up a welding supply store and get a set of torch tip cleaners. They should work well for cleaning the ports on the nipples.



























