Hi guys, I have somewhere in the neighborhood of 1200 rounds through my 300 RUM. The first 700-800 rounds through it were in a 300Wby chambering. It has never been babied and the loads i've had in it have been on the hot side. I have always kept it clean though. For the last several months I've noticed some noise and a slight rough feel as my cleaning patch moves from the end of the chamber out about 1.5 inches past. As I move away from the chamber the noise goes away and the patch moves down the barrel quietly. To me the obvious conclusion is the that what I am hearing/feeling is throat wear. In your experience is this level of throat wear (assuming that's what it is) excessive to the point of causing inaccuracy issues. My smith looked at it but is old school and does not have a boroscope to take a real good look. He didn't seem to concerned about it after looking down the bore using a mirror and light.