My step-son brought his CVA to the house saying "it ain't hittin' nuttin" ! (a University of Missouri graduate). At that time, I did not own a muzzleloader, so the only experience I had with looking down a "fouled barrel" was with some smokeless CF rifles. When those rifles are "clean", they appear clean. His CVA looked like a gravel road in there, mostly some plastic, which came out with a little elbow-grease and some Butche's Bore Shine cleaner. His bullet of choice is the Power-belt types. And after I got it sparkling clean, that puppy hammered those PBs into an inch and a half at 100 yds.That's the best it has grouped. Getting that stuff out of there really made a difference in his rifle. Hopefully he has learned something from this experience. And I learned lots about muzzleloaders, also.