Alox mate, it covers a broad range of velocities. I use it on my .357mags and my .44 m/l get no fouling in either.
Your fouling is possibly down to using BP, could it be mixing with the lube while hot and cooling as a goop? If so maybe beeswax/lard or trex would help but I doubt it. Having just read what you are firing, I'd have said alox or one of the modern hard lubes was best at the breech pressure and velocity that heavy slug is running at.
“If a cricketer, for instance, suddenly decided to go into a school and batter a lot of people to death with a cricket bat, which he could do very easily, I mean, are you going to ban cricket bats?” :- Prince Philip said after Dunblane
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