Well......where to start. I get to the range and start setting up between two individuals already shooting bolt guns. I set my stuff down on a bench behind and turn around towards the firing line I hear a loud boom and instantly my breath is knocked out of me and a pain in my stomach. The gentleman firing to my left had his rifle blow up! 300wsm Savage 116 Looked like hand loads I am fine(took the bolt to the stomach ) but it looked like a grenade went off in his left hand. All the skin torn off the palm and fingers with a 1.5 inch hole in the center. A good samaratin immediately got a tournaquette on and we bandaged the hand while we waited for the cavalry. Once the police and paramedics got there they took good care of him. Said they could not save the hand. He will lose it. Lots of blood and meat everywhere. The man's watch was in 10 pieces and the rifle was in about 100 pieces. The only two thing on the rifle that looked unscathed were the scope, although it was bent, and the barrel flew about 20 yards down range. The receiver was in 3 pieces, stock shattered, mag shttered and trigger group all over the place I feel lucky to only have a bruise. It has me shaken up. One of the few things I load top end is 300 wsm for my deer rounds. I did find a flattened and torn 300wsm case with a mostly good looking .308 projectile where his feet were when shooting. The state police took the rifle bits and ammo bits in a bag. Anybody got any ideas?? Over crimped, bullet set back? What makes a rifle blow and the projectile falls out of the mag well? I did not take any pictures out of respect for the old man and all of his blood and gore would have been in the pics. I truly hope he ends up ok. It is a shame he will lose his left hand. Please be careful out there!!!