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- The 37×145mmR was a series of rimmed-case, fixed-ammunition cannon shells for use in the 37mm Browning M4 autocannon. The rapid strides in aircraft protection made it necessary to develop an aircraft weapon that would fire projectiles with greater explosive and armor-piercing qualities than smaller caliber weapons. As a result, the 37 mm (1.46 in) T9 automatic gun was developed. It was standardized for aircraft use as the M4 cannon in 1942. The 37 mm (1.46 in) gun, M4, used the same high-explosive (M54) and practice (M55A1) projectiles as the 37 mm (1.46 in) antiaircraft gun, M1A2, but different cartridge cases were necessary due to the larger chamber of the M4 gun. The M4 was later replaced by the more powerful 37mm M9 autocannon. (en)
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- The 37×145mmR was a series of rimmed-case, fixed-ammunition cannon shells for use in the 37mm Browning M4 autocannon. The rapid strides in aircraft protection made it necessary to develop an aircraft weapon that would fire projectiles with greater explosive and armor-piercing qualities than smaller caliber weapons. As a result, the 37 mm (1.46 in) T9 automatic gun was developed. It was standardized for aircraft use as the M4 cannon in 1942. (en)
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