ORIGINAL: Flatland Hunter
Bore Butter has a reputation of building up over time in a Bore... loss of accuracy and many hours scrubbing it out can result from it's use. Next time out try leaving the Bore Butter out and see what happens... I think, personally, that is an extra step that is not needed...
I agree with Flatland Hunter. That has been my experience with Bore butter. For shooting saboted bullets, bore butter will give inconsistent results. I treat my Omega like a modern rifle. Clean with solvent, protect bore with 3 in 1 oil. Bore butter accumulates. That changes inner bore dimensions. Not good with a sabot shooter.
But still, congratulations w/ the Omega. It's an awesome M-Loader!!