Scottyryan called it years ago about the sort that pistol versions of military rifles attract, obviously not all rifled caliber pistol owners are this way but damn . . .
You mean the round actually fires? No ka-blooey?! I nearly shat after hearing that…the guy only said “ah geez”.
I think it Usually splits the case. The guy I know personally that experienced it with his son said it mostly fire formed the 9mm to the .40 chamber and the one I recall finding looked like that.
I would say there is a good chance that at least some mangled looking cases at ranges didn’t get that way from a mower or being stepped on.
I’ll try & find the .40S&W brass I have that was fired from a .45ACP Glock & post a pic. No splitting at all, just flared out. It wasn’t mine, and I wasn’t there, another instructor gave it to me.
Yep, that’s what I would say, too.
Well, I’m sticking with my story. 
This is the type of thing that well-intentioned gun restrictions are aimed at, people that shoot irresponsibly. I’m not saying they are right, I’m saying they usually have a reason and assuming they are evil is wrong.
Yup, I wasn’t trying to imply anything should be banned with that.
Any type of firearm can and WILL be shot irresponsibly, with that said rifle caliber pistols seem to be the star attraction for the low hanging fruit. I see their benefit as a work around the NFA/SBR redtape, especially for guys who cross state lines and or live in a state that has bans on SBRs.
I don’t think there are any will intentioned restrictions, just people wanting to engage in wrong doing without suffering consequences for their wrong doing.
Seen just as much, if not more, ignorant crap out of traditional sporting gun owners than anything modem military and considering a long time good way to get accidentally shot is via being out during deer or turkey season I don’t think my experience has been much of an anomaly.
The back story on this one is that the gentleman who violates the four basic rules of firearm safety was placing his open palm in front of the muzzle to check the function of his laser.
About that . . .
It appears this guy was using some sort of rail mounted VFG that came loose as he went to shoot in full auto. I don’t know the legality of a VFG on that particular G17 to G18 conversion but they sure didn’t use a thread locking compound on the mounting hardware.
I can’t believe nobody posted this classic.
https://youtu.be/gLB5nOtqjoU