Tonight i was cutting up an old cotton bed sheet for cleaning patches. I went out to test the size in my 50 and 54 and when i ran them down the barrel they came out looking rusty colored. The TC Bore Butter is supposed to protect the metal according to what it says on the tube. Any one had this experience with this stuff. Once you clean and dry your gun what do you guys use to oil the barrel? I try to stay away from the petroleum based oil.