I have read of this problem often on this forum. I have never had the problem. I use pure olive oil to clean and mostly spit patch for patch lube. I am not saying for sure, but wonder if cleaning residue isn't hiding in the barrel somewhere. I raise the question " is there such a thing as over clean"? My old rifle is not pristine, but not a rusty hulk either. The bore doesn't shine like a baby's butt, but not pitted either. I would describe it as a seasoned cast iron skillet color and smooth. I have polished barrels with steel wool and 3M pads, but never to a new silver dollar shine. Think of how these old weapons were carried and used in their hey day. But of course they were used daily, carried loaded for days at a time.