wiz,
this is a unsafe gun handling DQ in my opion. see rule:
US 10.3.2.1 Any discharge/detonation prior to commencement or while
loading, reloading, unloading or during remedial action in
the case of a malfunction.
you didn't have a "AD" since the bullet didn't leave the the berm area, or strike within 3m
hope this helps.
lynn jones