
HEAT Cartridge M371 is generally comparable to HEAT Cartridge M371A1. The M371 differs only in that it uses Percussion Primer M78; the standoff is staked to the body rather than threaded to it, and the nose cap does not contain the paper insulating cup.
No information about hazardous components.
Primer, Percussion, M78
TM 9-1300-203, Artillery Ammunition (1967)