I don't know how to share a video clip from FB to Snipers hide. But on my face book page I have a video clip of a bad guy loading a motor round into its mortar tube and running away and then the whole thing blew up probably killing the bad guy. My question is What went wrong ?
Mortars are propelled by a set of charges that ignite when the round strikes the firing pin at the base of the tube.
There could be numerous reasons that the round blew in the tube.
Faulty fuse on the round: Old corroded rounds that haven't been handled correctly, which led to the round thinking it was impacting the ground as it struck the bottom. Those old rounds don't have the safety fuses that our rounds do.
Tube is old and couldn't take the controlled explosion from the propellant. This is probably the reason that one went. With that explosion from the breach of the tube, the old ass round probably went also.
Old ass round could have had a breach in it, and as the propellant went off, it set off the round.
Also they might not have understood what the proper charge would have been for that round, and over loaded in hopes for more range, not knowing what the tube could handle, equaling a catastrophic failure.
There could have been something we didn't see fall in behind the round, creating an obstruction and a failure.
Just a couple of thoughts off the top of my head, hope it helps answer your question.