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it is a very very fine version of an actual lapping compound.  It is not as aggressive as some would say.  I use flitz after some ring lapping compound for initial factory bore polishing.  If your pards rig is that bad (and the excessive fouling, as you say, is NOT from fire cracking and erosion in the throat) then buy some of the non-embedding ring lapping compound from Sinclair and run about 50 strokes (remember to NOT exit the muzzle) and then the same with either JB or flitz behind that and that bore should improve greatly.