One of the unique features of the gun was the Obus à Charge Creuse de 105 mm Modèle F1 (Obus G) HEAT projectile.[3] HEAT warheads suffer when spin stabilized, a product of rifled barrels,[5] causing the French to develop the Obus G,[6] (Gresse).[7] This projectile was composed of two major parts, including the outer shell and a suspended inner shell, divided by ball bearings. This allowed the projectile to be spin-stabilized, and therefore more accurate than a normal fin-stabilized HEAT-round, while the inner shell did not move, allowing the warhead to work at maximum efficiency. The warhead, containing 780 gram hexolite,[8] could penetrate up to 400 millimeters (16 in) of steel armour and was effective against tanks at up to 3,000 meters (3,300 yd). As it combined a good accuracy with a penetration that was independent of range, it has been considered an "ideal round" for its day[6] The F1 was also designed to fire the OCC F1 Mle.60 high explosive projectile, the SCC F1 training warhead and the OFUM PH-105 F1 smoke round.[9]

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