Went out shooting and dragged along our oldest. He's getting into the sport and every trip enjoys it more. I decided to leave the high calibre stuff at home and focused on the 12ga and .22s we've got. Well it seems that every weapon I own needs some alteration to become 100%. The case in question this time though is my AR-7. The rifle needs to feed a specific ammo, and the mags have to be in juuuuust at the right angle or there are mis-feeds galore. Ok, store set up done; I had either a double powder load, or weak case, or...something. Ammo was Remington standard velocity, but the case head separated and blew the gases down through the mag and out the mag floor plate...into the palm of my hand. Now I've got this nice little divot carved into my palm with some powder grains speckled around it.