I picked up a .300 ultra mag for free from a buddy. The gun has seen better days but all and I don't think it's too bad. I've done some work on it that I'm not too sure about and I wanted to get some people's opions about weather or not I should fire it or not. I bore scoped the barrel and I found in the last probably 6 inches of the barrel there was a little pitting, and I unlike Aircraft, I can't seem to find a safe limit for corrosion, especially being that it's high powered round. I was thinking about getting the brownel's kit for cutting and crowing the barrel. I'm afraid that I'll loose not only accuracy but a ton of velocity due to the shear amount of powder that needs to burn before the round leaves the barrel. I think I screwed up when I bead blasted the gun. I of coarse plugged the barrel off and the chamber, but I bead blasted the rails that the bolt slides on, and then painted it with duracoat before I really thought about the fact that whole area is precision cut... Did I screw this gun up, do I just have an expensive piece of scrap metal?????? Any advise would be appreciated.