At the annual Collegeville, Pa. Bacon shoot yesterday a Savage O/U blew up. Top barrel flew to the trap house, bottom barrel which was still locked into the gun had a split open chamber area, shell which was also split open was still in the chamber. The side of the receiver blew off and hit the adjacent shooter in the stomach which only caused a bruise. The usual loud boom and the gun owner had broke the prior target. The shell was a reload, don't know what brand shell yet.