US Cartridge, 81mm HE, M821
This cartridge is a high explosive round developed for use in the M252 improved 81mm mortar system. It is intended for use against personnel and light materiel targets.
The complete round consists of a fuze, propellant charge, fin assembly, ignition cartridge, and shell body. The shell body made of Ductile Cast Iron, is loaded with a RDX/TNT filler. The ignition cartridge has a percussion primer and is assembled to the end of the fin assembly. The propelling charge is contained in four horse-shoe felt-fiber containers and assembled around the fin assembly shaft.
Collaborative Ordnance Data Repository