Most fouling problems have two causes - too little or improper lube or too loose a combination that doesn't scrub the bore top the bottom of the gooves.
; For most target shooting, spit makes the best, cleanest shooting lube. Stumpy's Moose snot lube strikes, for me, about 1" higher, and that's all, with barely larger groups, yet allows constant shooting without having to swab the bore. Most comercial lubes don't shoot cleanly enough for this, but some do, like Hoppe's #9 Pluss and Birchwood Casey's black concentrated lube that mixes with water as well as Stumpy's formula that I almost followed. I don't think the %'s are critical. Mine was something like Beeswax 2oz.; Castor oil 8oz; Murphy's Oil Soap 2oz.approximately. I don't know if anything other than Castor or Murphy's is necessary, & those might jsut work alone, but beeswax alone won't work. It needs something to soften it a lot, yet with 40% vaseline or neetsfoot oil(castor oil might work) makes a GREAT bullet lube for BP slugs in ML or CTG guns. The other's, Castor oil and Murphy's might work by themselves without the other or beeswax included.