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Method of making a polymeric subsonic ammunition cartridge

  • US 10,048,052 B2
  • Filed: 09/24/2015
  • Issued: 08/14/2018
  • Est. Priority Date: 11/10/2010
  • Status: Active Grant
First Claim
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1. A method of preparing a polymeric subsonic ammunition comprising the steps of:

  • providing a substantially cylindrical primer insert comprising a base having a top surface opposite a bottom surface, a substantially cylindrical coupling flange that extends from the top surface, a primer recess in the bottom surface, a flash hole aperture positioned in the primer recess extending through the bottom surface, a flash aperture groove positioned in the primer recess around the flash hole aperture, and an extraction flange positioned about the circumference of the bottom surface;

    forming a polymeric middle body by molding at a first end a first polymer composition over the substantially cylindrical coupling flange into the flash hole aperture and into the flash aperture groove and molding a second end comprising a neck coupling region, wherein the first polymer composition extends from the neck coupling region to the flash aperture groove to form the polymeric middle body to form a propellant chamber having a propellant chamber volume;

    forming a polymeric bullet-end component from a second polymer composition, wherein the polymeric bullet-end component comprises a polymeric coupling region opposite a bullet aperture separated by a neck region;

    positioning a propellant chamber insert in the propellant chamber to reduce the propellant chamber volume by between 25 and 80% to a subsonic propellant chamber volume; and

    coupling the neck coupling region to the polymeric coupling region to form a subsonic propellant chamber from the bullet aperture to the primer flash hole aperture.

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