[motto]

Thanks Dan, hard information on artillery usage seems hard to come by but it now appears there was a precedence to what those fellows were doing in Korea which to my eyes doesn't appear to be a combat situation, more of a test firing or tickle up? The situation just doesn't seem that serious.
Unfortunately Bill Ziegler doesn't give any information on what angle they were firing at and we will probably never know if all firings at that angle resulted in detonation.
Perhaps the question of projectile attitude hasn't been asked because the majority of shells do detonate and it's of no more than technical interest.

David