Well, thats right in my area..if i were in the country that is.. I know the area intimately. The Military did maneuvers in the area during early WW11 in preparation for North Africa. There was a lot of left over stuff found to this day. Until I saw the video I was imagining that these two folks had found one of the several abandoned Grant tanks from the BLM desert and messed with some unstable rounds inside. Obviously not the case. Will be interesting to learn the cause, but perhaps the aged metal in the breach disintegrated.. Too bad
Gasoline engine with a carburetor?
Maybe someone decided they could make a homemade round and fire it that way.