Don't know real crazy. Because it was an Under Hammer it blew up by the Nipple, blowed the Nipple off, they couldn't find the Trigger and destroyed the Stock.
He said most of it got his Chest, could see where it got his Arm.
He said it put a big hole in one side of his Chest.
Since the 60's I really haven't had any trouble with Muzzleloaders.
I had a Pump Shotgun one time cracked the Barrel.
oneshot