I had two problem children who's barrels wouldn't clean up. One was a 1895Win saddle ring carbine. No matter what I tried,solvents, brushing even Rem Clean wouldn't get the lumps out of the barrel. Made in 1915 probably had copper nickle (cupronickle) fouling and wasn't about to try any ammonia based cleaners. Soaked patches with Butches bore shine wet the barrel and scrub and got blue and black patches. Same with Hoppes patches let it really soak the barrel and got green patches. So every week or so wet the bore and let it soak. Just for grins and giggles used a 8mm bore brush with one episode and the lumps went away. The other one was a Canadian property marked BSA single shot 22rf martini. Got lots of bits of lead and they must have shot a bunch of copper plated 22's. Scrubbed and scrubbed no joy. I had bought another cocking lever as the old one was messed up. So took it outside and shot it to see where the firing pin hit the rim. Sometimes you have to mess with the horns on the cocking lever to adjust the firing the strike. Well the lever needed no adjustments but checked the fouling and the lumps were gone. cleaned it well and the Mark I eyeball could see no lumps. That one is going out to a smith that speaks SingleShots. Plug about 8 scope base holes, install steel picatinny rail,clean up the metal, bead blast and blue. For some funny reason I've become quite fond of a bead blast and blue job as the blueing comes out almost black and looks nice. And correct a problem with the breech block not contacting the extractor as it should. Will only pull the case part way out of the chamber. Frank