Hi guys,
Long time no see. I recently got wind of an explanation of why I sometimes see my cartridge shoulders dented. I think I'm headed toward filing and polishing some of the hump on the extra 3rd bolt lug.
I've read as much as I could find here and elsewhere online. I'd like to know what the purpose of that hump is. I think the answer is that it's there to absorb the repeated hits from the next cartridge in the mag, protecting the bolt lug from being hit instead. Am I missing something? I would like ya'll's thoughts on this.