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I have recently had some experience in this with a 32-40 Win. '85. At 50 yd. I initially got 5-6" 'groups' and obvious
tipping of the bullets. The bore admittedly was 'iffy' but why not try? It was cleaned, and cleaned and electo cleaned
by a friend overnight and patches came out white-ish (definately not dark). Going thru back issues of 'The Fouling
Shot' (off. pub. of The Cast Bulllet Assoc.) I read all I found on 'fire-lapping'. I didnt want to use the courser grit, ie,
220ish, because one can always get more aggressive.
JB Bore Polish was my choice. I made a moderate load (900-1000 fps), just started the bullet in the case mouth
and finger applied the JB to the lube grooves and exposed bullet, then seated it in the case as normal. I single loaded
and shot these at my 50yd junk as offhand practise 15 times.
The bore still looks rough, tho better but I have been hitting a 3" swinger regularly with my std load and got a 1" and
1.5: three shot group the other day from a very casual deck rail 'bench'.
A dozen shots thru it and fouling isnt bad and no signs of leading (yet). It may not be a match rifle but Im satisfied
with this quick and painless technique. (I had nothing to lose in this case so I win)
PS: I think a rough old bore would probably be hard on any paper patch but defer to those who know such things.