TarponStalker, you're describing precisely the same problems I'm going through with my 3 year old Rice barrel on a custom built flintlock. It has always been rough on patches. I used to shoot 90g 2F Goex, but now must shoot 80g Swiss, which, I think, seems to be a lot hotter shooting powder. I swab with a little alcohol on a cleaning patch after each shot. TOW mink lube. Thick patches anywhere from 0.018" to 0.023" miked. I usually use an OxYoke felt wad. Use my own cast balls, either 0.530" and lately have tried some cast 0.526" (Bag Molds by Larry Callahan--very nice). There seems to be one area on the patch that wears through the worst. Well, just lately I ran into very nice Rice Barrel rep who was nice enough to send me some of their lapping compound. I've lapped the bore twice now for a total of maybe 100 push/pulls. The barrel does load and clean up more smoothly but patches still are cutting and especially on one side I described previously. I could keep lapping some more, but I don't want to over do and go too far. I don't know what the limit should be for lapping. I know I should be able to easily shoot a 0.530 ball with Mink Oil on a 0.020" patch and have the patch come out in pretty good shape. If I had the tools and shop to unbreech the barrel I would, but I guess it is what it is. When you solve your problem please let me know.