Here is my results... back whenI first started muzzleloading I used it because I thought you were supposed to. That gun was a Remington 700ML which shot MOA. OK the next gun was a TC Encore again no.13 and Bore Butter = MOA. The next Muzzleloader was a CVA Hunterbolt .45... MOA with 195 Powerbelts ( which fragmented into tiny pieces on a 30 yard doe [:@]) again no.13 and BB. Now my most recent guns... TC Omega and a Knight Disc Elite... the Omega under MOA, you guess it 13 and BB. With the Knight I used Mean Green window washing fluid and Break Free CLP,,, I never could get the gun to group worth a hill of beans and I tried all the loades that the Elite was susposed to like. the reason I changed was because all the ML guys in the know said BB was crap... no way to season a high performance barrel they said,,, well I don't know what does or doesn't do but it sure seems to work for me; no rust and 100 yard MOA groups. Maybe TC does have tons of BB lying around to sell ( kind of like the miracle sauve company on Andy) and that's why they push it... but heck I like it,,, I even like the way it smells... makes me feel like a real black powder shooter!!