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Cartridge, 105 mm: HEP-T M393 series
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Боєприпаси, ракети та високоточне озброєння
The 105 mm HEP-T M393 series rounds are fixed, with the projectile rigidly secured to the brass or steel cartridge case by two crimping rings. The projectiles of the M393A1 and M393A2 have a relatively short ogive and are encircled by two copper drive bands. The projectiles have thin-walled steel bodies filled with Composition A-3 (RDX/Wax 91/9). The M393A1 contains 2.86 kg and the M393A2 2.994 kg. On impact with a target the explosive filling has time to spread over the surface of the target before the base
detonating fuze functions. The resultant overpressure causes shockwaves to form throughout the target, close to the detonation, causing internal spalling and damage; there are also secondary fragmentation effects. The base detonating fuze on the M393A1 is the M534 while the M393A2 has the M578. The projectile base also has a protruding housing for an M12 tracer which is directly ignited by the flash tube of the M86 primer as it extends the full length of the cartridge case. The M12 tracer burns for a minimum of 2.5 seconds. The cartridge case used with the M393 series may be either of the 70:30 brass M150 or steel M150B1, both having an M86 electrical primer in the base. The propellant is a nominal 2.68 kg of single-base M1 packed in a bag. Before loading, the primer is normally protected by a metal clip over the base of the cartridge case. The muzzle velocity for the 105 mm HEP-T M393A1 and M393A2 is 731.5 m/s. Maximum range is 9,510 m. The training round used as the equivalent for the 105 mm HEP-T M393 series is the Cartridge, 105 mm: TP-T M393A1 (not to be confused with the operational round). The TP-T M393A1 projectile has an inert filling but retains the M12 tracer; the steel M150B1 cartridge case is used. A similar and more widely used training round is the Cartridge, 105 mm: TP-T M467. The inert projectile on the TP-T M467 has thicker steel walls than the TP-T M393A1, with a light alloy nose section threaded to the top. Both the TP-T M393A1 and M467 are ballistically matched to the HEP-T M393 series. MECAR SA of Belgium have developed their M1053 HESH-TP-T which is ballistically matched to the M393A2 HEP-T.