
This round is essentially the same as the Drill Rounds M9 and M10. They consist of a 1 piece hollow bronze casting (cartridge case and projectile) simulating service ammunition. The nose has the M42A1 Dummy Fuze. A replaceable base is also provided to receive an inert primer.
No information about functioning.
Projectile, 3 inch Drill, M9, M10
TM 9-1904, Ammunition Inspection Guide (1944)