Ammunition Cartridge With Reduced Propellant Charge.
Patent, Filed 14 Aug 95, patented 23 Jun 98,
DEPARTMENT OF THE NAVY WASHINGTON DC
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An ammunition cartridge having a reduced propellant charge and an initial reduced cartridge volume is provided. The cartridge volume is reduced by partially filling the cartridge case with a foam filler using a male mold form. the male mold form is sized to provide the desired propellant volume and tapered to maintain the desired cartridge pressure during the propellant burn. Alternately, the foam filler may be formed externally and inserted into the cartridge case. In that embodiment, an adhesive retainer is used to secure the foam filler to the base of the case. During firing, the foam filler is turned into a gas, thereby providing the large volume of the case for expansion of the propellant gases. After firing, the case is free of residue, all of the foam filler having been expelled as a gas.
- Ammunition and Explosives