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The Mk H High-explosive Shell is standard for issue and manufacture although it is not widely used for infantry support. The Mk IAZ Cartridge Case with M23A2 Primer is standard for the high-explosive shell. However, older rounds may be found with the Mk lA2 or Mk IA1 Cartridge case and
M23A1 Primers, or possibly with Mk 1 Cartridge Cases and M23A1 Primers. Approximately 550 grains of FN1-l powder is poured loosely into the cartridge case. The projectile is made of bar steel and has an explosive charge of 0.06 pounds of TNT. It is 4.45 inches long and has an ogive radius of 2.25 calihers.
Since it is adapted for a base detonating fuze, the nose is continued to a rounded point. The total weight of the projectile with fuze and bursting charge is about 1 pound. The complete round is 6.92 inches long and weighs approximately 1.61 pounds The M38A1 Fume is standard, replacing the M38, (modification to the detonator assembly) for the Mk II round. It is a typical nondelay fuze, being located in the base of the projectile and having no delay between the firing pin and the detonator. There is no positive separation between the detonating elements and the booster, so the fuze is not boresafe. On impact, the firing pin is carried forward by inertia and initiates the explosive train of detonator consisting of priming mixture, lead azide and tetryl. The projectile is painted olive drab and stenciled in yellow.
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