Seems like Hornady/Pacific 366 parts have dropped off the face of the earth. Looking for the brass/bronze primer drop tube for a Hornady/Pacific 366 shotshell loader - listed as P/N 050025 on Hornady's parts list. Would also consider the upgraded version that has the primer shut-off capability - listed as P/N 010053.
FWIW, I did call Hornady and was told these parts were not currently available, and there was no ETA for future availability.
