We were firing HE using M557 PD fuze* charge 5 out of an M198. Best guess is that we accidentally hit a bird, but either way that HE round went off 300 meters out of battery. Needless to say the Drill Sgts were very nervous, and we all had to pat each other down to make sure no one had been hurt. We recovered some shrapnel from the Deuces. We had to sit there until a thorough investigation could be done. It's funny, because that happened in 1993, but I still think about it every once in a while.