About the only guys I know of which can shoot a dry patch successfully, are those loading well oversized balls with very thick teflon patches, ie: .022", mostly through false muzzles and in match rifles only, and cleaned between shots.
I firmly believe that a load used in a hunting rifle should allow at least 3 shots without having to be wiped. I believe it is the hunter's reponsibility to kill the animal as quickly and as cleanly as possible. There are times when a coup-de-grasse is required, animal on the ground, back broken, legs broken, hit through the neck, still a alive, struggling to get up, wild terror in it's eyes, bleating or whatever. It is our duty to finish that animal as quickly as possible. I just don't think that can occur if the bore must be wiped prior to the gun being loaded.