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Ammunition casing

  • US 8,240,252 B2
  • Filed: 03/07/2005
  • Issued: 08/14/2012
  • Est. Priority Date: 03/07/2005
  • Status: Active Grant
First Claim
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1. A 22, .22-250, .223, .243, .25-06, .270, .300, .30-30, .30-40, 30.06, .303, .308, .357, .38, .40, .45, .45-70, .50 BMG, 5.45 mm, 5.56 mm, 6.5 mm, 6.8 mm, 7 mm, 7.62 mm, 8 mm, 12.7 mm, 14.5 mm, 20 mm, 25 mm, 30 mm, or 40 mm caliber ammunition article comprising:

  • an ammunition casing, the casing defining a generally cylindrical hollow body having first and second ends and consisting of a caselet and a cap;

    a propellant disposed and confined within said hollow body anda primer for disposed at the first end of said casing in combustible communication with said propellant;

    wherein the caselet comprises a polymeric material that has a room temperature (about 23°

    C.) notched Izod impact strength, measured in accordance with ASTM D256-00, greater than about 10 ft lbs/in and that has a ratio of notched Izod impact strength at room temperature to notched Izod impact strength at about −

    40°

    C. of less than about 4.

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