Dispersion Versus Cyclic Rate Test of 4.32mm Cartridge
Technical note (Final)
ARMY MATERIEL COMMAND ABERDEEN PROVING GROUND MD HUMAN ENGINEERING LAB
Pagination or Media Count:
An adjustable brake compensator was used to control, and minimize, round-to-round dispersion of three rounds fired serially in a burst from a rifle. Two weapons, an M16 and a SPIW, were rebarreled to fire 4.32mm ammunition. The impulse levels during the test were on the order of o.57 pound-seconds. Only the SPIW was further modified to permit external control of firing rate. Ten subject soldiers fired the M16 from the prone and standing positions at its natural rate, and the SPIW from the standing position at 1500 and 800 rounds per minute rpm. The mean extreme spread MES for the SPIW was 10.1 mils at 1500 rpm and 13.1 mils at 800 rpm. For the M16 prone position the MES was 10.2 mils, and 14.7 mils for the standing. It was concluded that a tunable brake compensator will reduce dispersion however, the gain in reduced MES is not proportional to the reduction of impulse levels.
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