I've been handloading since 1980. From time to time I've loaded sound ammunition at ba..'s to the wall's levels. Happily I've not ever destroyed a gun. Once upon a time, however, I did have a little excitement w/ a M-70 in .243 Winchester. I wanted a little more juice since the plain factory load .243's didn't seem so very impressive. The extractor, etc. were never found. A nice Cajun gunsmith in Chalmette, La. fixed my rifle. And... I throttled back on the load. Later I just moved on to a heavier caliber. Perhaps this fellow just made a mistake. Perhaps he was not so impressed with the factory level loads and just wanted to improve the performance of the round a bit. I don't know. I do know I was sick when I thought I'd boogered up my M-70. Hopefully the gentleman who owned/shot this revolver was not injured. Almost certainly he has learned a very hard and regrettable lesson. JMHO.