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Initial production Test of Cartridge, 81-mm, HE, M374A2 with Reduced Bourrelet and Waterproofed Ignition - Propellant System
ABERDEEN PROVING GROUND MD MATERIEL TESTING DIRECTORATE
An initial production test was conducted on the 81-mm mortar cartridge, HE, M374A2 M374E5 which features a reduced bourrelet and a water resistant ignition - propellant system. Various tests were conducted to determine if the test item was equal to or better than the M374E5 test cartridge submitted previously for US Army Test and Evaluation Command evaluation. Residue tests were satisfactory velocity level differences of test rounds were significant though of small magnitude compared with the control M374, and velocity and range dispersion were equal to or better than the control pressures were satisfactory test rounds did not perform as well as previously in waterproofness tests because the ends of the propellant bags were sewed and not heat-sealed as in the earlier version there were short rounds in the rain test, but none in the puddle or humidity test rough handling tests using charge protector muffs were satisfactory solar-radiation tests with charge protection were satisfactory and cook-off hazards and maintenance with test rounds were not significantly different from that experienced with control rounds. United States Army Infantry Board representatives found no human factors problems except that the white increment protector muffs should be black or brown to conform with current camouflage techniques.
Final rept. 30 Mar-14 May 1970
Approved for public release; distribution is unlimited. Document partially illegible.