CPC F42B 5/307 (2013.01) [F42B 5/02 (2013.01); F42B 5/26 (2013.01); F42B 5/30 (2013.01)] | 13 Claims |
1. A subsonic ammunition comprising:
a primer insert comprises a top surface opposite a bottom surface, a substantially cylindrical coupling element extending away from the bottom surface forming, a primer recess in the top surface that extends toward the bottom surface, a primer flash aperture positioned in the primer recess to extend through the bottom surface, a flash aperture groove in the primer recess that extends circumferentially about the primer flash aperture, and a flange that extends circumferentially about an outer edge of the top surface;
a polymeric casing body comprising a generally cylindrical hollow polymer body molded over the substantially cylindrical coupling element, into the primer flash aperture to form a flash hole and into the flash aperture groove and extending toward a mid-body coupling joint;
a nose comprising a projectile aperture that extends to a neck connected to a shoulder that transitions from the projectile aperture to a nose coupler, wherein the nose coupler is connected to the mid-body coupling joint;
a propellant chamber formed between the projectile aperture and the primer flash aperture defining an internal volume; and
a propellant insert positioned in the propellant chamber to reduce the internal volume of the propellant chamber by at least 10%, wherein the propellant insert comprises a first passage comprising a first aperture having a first diameter about the diameter of the flash hole that transitions as an arc to a second passage that has a second diameter that is larger than the first diameter, wherein the first diameter has a uniformed diameter that extends to the second diameter.
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