A little over a week ago I took my SMR out for a shoot and cleaned it thoroughly. I probably ran 30 patches down it until all I was getting on the swabs was some really light color which I thought just to be some graphite per a video I seen on Black Powder TV. So anyways this morning I'm on here reading a few posts and decide to run some bear grease down the barrel and I come back with rust. Is this a major issue? How can I prevent this and get in front of it now? Included are pics of a couple patches.