The damaged PH barrels were primarily from commercial Mauser actionned rifles; might have been damaged Midlands as well, but I do not recall. The Midland barrel is just a Mauser sporting barrel with a slightly longer shank.
The most dramatic specimen was from a .30-06 which was fired in extreme cold, after having the muzzle shoved in the snow. It shattered into 7 pieces. The rifle was gone from the receiver ring forward. Fortunately the shooter had his left hand in a thick mitt. I used a punch to unscrew the stump from the receiver; the action was intact and unharmed.
The most dramatic specimen was from a .30-06 which was fired in extreme cold, after having the muzzle shoved in the snow. It shattered into 7 pieces. The rifle was gone from the receiver ring forward. Fortunately the shooter had his left hand in a thick mitt. I used a punch to unscrew the stump from the receiver; the action was intact and unharmed.