Semisane - you have mentioned Liquid Wrench before & I have always intended to give it a whirl, but
just never got around tu-it.
I am assuming you don't have to wipe the bore between shots, or ever, while shooting.
As to Mink Oil and Bore Butter not shooting well with a "given" load, rnnhntr, but LHV shooting well, try reducing the load
by 5 or 10 grs. with the less slippery loads. I found this myself, when using LHV, I had to increase the load by 10gr. to get the
same "good" accuracy I was getting with less slippery lubes.
Thus, if the LHV is shooting well with a given load, it is possible the other lubes will shoot better with slightly less powder. 6" groups at
50 yards are smoothbore groups, or worse (according to many guys here). That's about what my smoothbore does, with the odd flyer
thrown in that doesn't hit the paper.