M1 Garand blow up

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Sunday a fellow shooter just purchased an M1 chambered in 7.62X51. He never owned or shot a Garand. While he was sighting in I noticed on certain shots there was a muzzle flash. I looked at his loaded clips and he had a selection of LC09 and steel zinc coated Colt ammo. When I see him again I will provide the Youtube video for his consideration.