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Meanwhile, in the winter of 1943-44, increasing German employment of jetpropelled aircraft burning kerosene created the need for .50-caliber ammunition capable of igniting aviation kerosene. Half a dozen different Ordnance plants worked on the problem. The Des Moines Ordnance Plant produced the most satisfactory model, a 500-grain bullet containing 90 grains of an incendiary mixture composed of 50 percent magnesium aluminum alloy, 40 percent barium nitrate and 10 percent potassium perchlorate. A single-base powder was used that was found to be superior to double-base powder for firing extended bursts. Quantities of the Des Moines cartridge, listed as the T48, were shipped to the theatres in the winter of 1944-45 and proved so effective that in May 1945 the T48 bullet was standardized as the .50-caliber M23 and the round as incendiary cartridge M23. A report of June 1945 from Headquarters, U.S. Strategic Air Forces in Europe, was enthusiastic: "Most pilots stated that aircraft burst into flames more readily when hit with this type ammunition in contrast to armor-piercing incendiary ammunition. Many enemy aircraft burned after having been hit only two or three times. . . . One pilot destroyed 10 aircraft on a single mission by firing short bursts." This testimony notwithstanding, design of incendiary and armor-piercing incendiary ammunition remained at the end of the war a problem requiring much additional study.
По форме очень похоже на М23, но у М23 нет дыры в носу........Походу, получается так, что в СССР могли поставлять экспериментальные варианты на тему Т48 (девичья фамилия М23) и вполне может быть, что это оно и есть.