Breech Bang!

[Tonka]

I used to shoot a lot of surplus WW2 ammunition. The .303s used to work seamlessly but the Russian ammo I'd use for a Mosin Nagant carbine used to give a lot of trouble. A few times the firing pin went straight through the cartridge and it would blast out of both ends.
I just made sure I had decent ballistic lenses in my glasses, and carried on shooting them (after clearing the jam of course). I figured any scars would be made worthwhile with the cool explanation. I was very young.