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The cartridge is a training device for all 60mm mortars. The cartridge provides realistic mortar firing training at distances which corresponds to range fire distances in the ratio of 1 to 10. The 22mm sub-caliber practice cartridges, M744 (charge l), M745 (charge 2), M746 (charge 3), and M747 (charge 4) are comprised of a steel bodied projectile which is assembled to a cartridge case containing a propelling and ejection charge. The projectile is flattened at the tip and contains a percussion piece assembly and smoke charge. A wingshaft assembly containing stabilizer fins is pressed fitted into the body of the projectile. The propelling and ejection charges are contained in two separate chambers located in a jet housing assembly, which is threaded into the base of the cartridge case. The cartridges are manufactured in a variety of four propellant charges. Each charge can be identified by notches on the jet screw assembly. The 60mm M3 Sabot (INERT) is designed to fire the 22mm sub-caliber practice cartridge. The sabot (aluminum alloy body) has similar bore riding dimensions and configuration of a 60mm mortar. It contains an insert 22mm barrel placed longitudinally to receive the 22mm sub-caliber cartridge.
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