I am new to this Forum and first generation firearm owner. I store my firearms in a safe, and I have some that unfortunately are safe queens, several times a year I clean each firearm even if it has not been shot since the last cleaning. When cleaned/stored the last patch through the barrel is clean, then the final patch is damp with a gun oil. I have mostly bolt action rifles, Mauser 98, Swedish Mauser, M48 and several modern bolt actions Ect. When I go to clean what should be a clean rifle, I find a dirty barrel. Sometimes so dirty it takes as many as twenty passes of a patch before I get a clean patch. I use Hoppes #9, Break Free power blast, Rem oil and Lucus gun oil all in moderation. The patches on the "clean" gun come out black. What is happening here and is this normal? BTW this is not happening with the handguns.