I picked up a nice Lee Enfield in very good shape. The stock needed some work but my concern was the dark bore. I've owned and shot a lot of milsurps over the years but this was the first time I've tried to bring shine back to dark bore. The rifling is very good and strong and there's no pitting evident, but it's dark with old fouling. I've been through about 20 cycles of Hoppes #9, brushing, patching (with Break Free), until I get a clean patch. When I start the process again, it's like I've never touched it and the patches come out black. I don't want to hit it with any actual abrasives like steel wool or valve grinding compound. I doubt the fouling will affect accuracy, given how good the rifling is. I was told that several cycles of shooting and cleaning with help as the heat expands the molecular structure and permits deeper cleaning, but I've never met anyone for whom that actually worked. So my fellow gunnutz, any thoughts?