I have an old model .38 trooper 4" with what appears to be a bulged barrel. I had been shooting standard vel .38 special through in with good accuracy, but when I run a bore brush down the barrel it goes about half way down then has no resistance for at least a half inch then is tight again. Looking at the outside arond the barrel where the indetation for the ejector rod is there is a bulge that can be seen if you put a strait edge against it. The gun functions and locks up great. It has alot of holster wear, less than 50% blue left. I think I should be looking for a new barrel, but what would cause this and was it dangerus to shoot the gun?