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This nice M1 was a victim of Korean Military Surplus Ammo. The problem is in the heat treatment of the cartridge cases. The split is called a "P" split. This is when the case splits at the head and the split goes through the primer pocket. KaBoom. There are 6 cases of M1 Garand and 1903 rifles thw ere destroyed by this ammo.
This is the cartridge that blew up the M1
Doug