I helped with the local high school trap team this year. Top Gun shells were provided. We had maybe 1 shell out of every 3 boxes that didn't go off, different guns, different gun manufacturers. Looking at the duds, each of them had barely a mark on the primer. Primer was sitting way too low, don't know if it was a problem with the primer or the hull. We were told that a school in a neighboring town also had the same problem with the same loads.
