Not sure where this belongs, please move if appropriate: when you take friends to your range, check their ammo and gun! I took some friends to the range today, didn't check the ammo because I had checked the rifle. No one hurt and the rifle seemed ok, but I had to use a ramrod to knock the .270 Win case out of the .270 Weatherby chamber. I recommend he get the rifle checked by a gunsmith.

Had a buddy recently fire 270 Ammo in his 7mm Rem Mag. Nice 700 BDL.
It happens all too frequently.
No injury but rifle is out of use until gunsmith remedies with new barrel.
Casual shooters can benefit from guidance and oversight by those more familiar to shooting.
Thanks for the reminder.

GOOD POINT, Gene. Once was there when a guy put a 223 in a rifle chambered for 222 mag and touched it off. Result was a separated case head. No serious injury to the shooter (lucky), but could have been bad. Have heard or read about shorter rounds with a bigger bullet (say a 7mm-08 in a 6.5mm-06 or 25-06) that went bang and resulted in serious injury.

At our range, we had a guy shoot an old Mauser (93 I think) originally in 7x57 that had been rechambered to 7 mm mag. I'm told it had worked for years, but the scope was pulled out of the ceiling in the shooting shed, the gun was destroyed, and he had minor injuries. Now at our Public Sight In Days, if your rifle doesn't have the cal stamped on it and the box of ammo doesn't say the same thing, you don't shoot, period. A good policy I think.