First off I'm glad I'm alive right now. Still shaking for about an hour afterward I settled down and finished the shooting with the other guns. I did what we all know not to, and start with a higher end load, not working up slowly and it *Rule 4 Violation* near cost me my life. The load was 45.5gr H380 under a 180 Scirocco at 2.845". It blew the bottom off the bolt, blew the cartridge below it in half leaving only the back half of the case left, the front end with the bullet were gone. The 3rd and only other round in the mag was mangled. The mag follower was blown in half, the lower front corners of the mag were split down to the bottom with everything blown out the bottom. The synthetic stock split vertically completely through front and rear. At the front it ran about 6" forward and the rear it ran back into the grip and stopped. I'm glad it wasn't walnut. My Leopold survived as well as the actionand barrel were intact as was the upper visible area of the bolt and op rod. The Oehler 43 measured 81,500 PSI. There was some interferrance and the "auto omit" feature was activated so it deleated the shot just afterward and automatically replaced it with another that was just some interferrance registering as a shot too. I'm not sure of the velocity of the shot, I just looked at the PSI because of what happened, but the PSI was indeed 81K, not what we would think could blow apart a bolt. I thought these things were at proof tested to at least twice their operating PSI, at over 100,000psi, I guess I was wrong. I wonder if the action is still good after that PSI, if you could even get it open and off the case that's stuck in there. Makes me wonder what the PSI in the starting load would have been. No matter how pressures follow other book loads doesn't mean squat, so be carefull starting a little high to save time and bullets as I was. That was a $1400+ BIG mistake.