I loaded up some .243 win brass with 55 gr nosler spitzers everything went good till the last round. I looked after I shot it and the case neck was split. The barrel was brand new and head spaced by Kevin @ stockade guns and seemed to be OK with the others. Just don't know what would have caused it.. The barrel was pretty hot from shooting. Primers looked OK and the other brass looks fine also. I'm just over the min charge also no where near max.