No oils or lubes in the bore
FFF powder instead of FF
Winchester Triple Se7en primers
Forceful-compacted loose powder seating
Black nylon brush bore-swabbing with 91% alky/plain blue Windex 50-50 mix
Heavy bullets and sub-100 grain powder charges
Swab with wet patch every 2nd shot

That's what seems to be the best ticket tocombat the crud ring.
I sincerely believe that T/C Inc doesn't even know why you have a severe case of it. They are shopping for answers to this day -- even read & use some of the suggestions we post on boards like this one.