Originally Posted by
Don McDowell
Paper patching with black won't keep the bore clean. The powder is behind the bullet and that's where the fouling comes from. About the only way to shoot patched dirty (without fouling control) is to use a dual diameter bullet, that the base is at or just below bore diameter prior to patching, and using either a lube cooky or a lubed wad of some kind under the bullet and lubing the exposed patch with something like jojoba oil.
Seth Cole and other produce 7 and 8 lb tracing paper that is very thin.
As Leadpot pointed out if you're patching a grease groove bullet that is already groove diameter and then putting paper on top of that it's not a particularly good thing to do, and may cause more problems than it solves.