In 1981, the Naval Weapons Center tried a 350 round/minute cyclic bipropellant gun, using 90% Nitric Acid and a proprietary hydrocarbon (probably a low molecular weight alkane, like Propane).
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In the 1950s through 1970s, a mixture of 63% Hydrazine, 32% Hydrazine nitrate and 5% water was used in experimental 37mm gun firings and later in 120mm gun firings.
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One of the later (1991) successful gun fuels was a saturated solution of Ammonium perchlorate in Ammonia.
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