Unfortunately, I got to see something like that. An idiot chambered a 270 into a 7mm mag chamber and was going to let his girlfriend shoot the gun. I told her to walk away. He said I do it all the time. Then, KABOOM. The barrel didn't split, but it swolled up like a snake that just had dinner and blew the bolt back in his face. I've been around guns and shooting them most my life and they still scare the crap out of me. Never take gun safety for granted and never assume a gun is safe. I don't know how many time someone has handed me a loaded and live gun without telling me it is. I will show a person the gun is empty, then hand it to them chamber open and NO rounds.

How a mistake with a gun can almost kill you !!!
 

Same here some folks say I'm up right about it but safety first!