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I have heard bad things about bore butter.
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I have also read bad things (barrel pitting) associated with Bore Butter on the muzzleloader forums I follow. If I recall correctly, if there is ANY residual moisture left in the barrel after cleaning, the bore butter either reacts with it or traps it against the metal causing pitting. If you are shooting saboted bullets, there is no need at all for Bore Butter. I'm sure there are alternatives when shooting full bore conicals and maxis.
After cleaning, I would swab with a light oil (I use three in one or WD40 after cleaning), making sure I snap a couple of primers before loading.