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The 37 x 145 mm R 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 gun (1.46 in), 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. ==Ammunition== Ammunition was issued in the form of fixed rounds, consisting of: *H.E.T. shell, M54, with Point-Detonating fuze, M56 *Practice shell, M55A1, with dummy fuze, M50 *A.P. shot, M80. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「37x145mmR M4」の詳細全文を読む スポンサード リンク
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