Anybody ever had a steel magnum revolver that was was shot with full mag loads more than a few hundred times that did not flame cut a little bit? All mine Have some And I do not worry at all. Anybody ever had one that was bad enough to cause a problem? Most seem to indicate that it progresses to a point and then more or less stabilizes? It seem some people freak out when they see that small amount of erosion above the barrel cylinder gap. I contend it is normal and calls for more shooting to black it out
dogdoc