Method for uniformly sizing polymer cartridge neck
AssigneeTrue Velocity IP Holdings, LLC
InventorHarold F. Beal
Life of this patent
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Abstract
A method for uniformly sizing polymer-based cartridge necks in ammunition cartridges includes providing a neck sizer and aligning the polymer cartridge below the neck sizer. The cartridge is pressed into the neck sizer where the pressing step causes the cartridge neck to be compressed in the neck sizer so as to reduce the inner diameter of the cartridge neck to less than the maximum outer diameter of the bullet to be fired from the cartridge. The pressing step may also involve compressing excess polymer material from the cartridge neck through flutes in the collet die of the neck sizer to form external neck ribs about the outer surface of the neck. The neck ribs aid in concentrically aligning the polymer cartridge in the chamber of a firearm to improve accuracy of the bullet fired therefrom.
Claims20
A method for uniformly sizing a polymer-based ammunition cartridge neck of an ammunition cartridge, the method comprising:
- providing a neck sizer, the neck sizer having a housing enclosing a collet die with at least one flute, an upper stopper removably engaged about an outer surface of the collet die, a dowel extending through the upper stopper and into the collet die, and an external lock removably engaged to an upper end of the housing;
- aligning the cartridge neck below the neck sizer;
- pressing the cartridge into the neck sizer so that the cartridge neck abuts an upper end of the collet die;
- and
- wherein the pressing of the cartridge into the neck sizer compresses the cartridge neck between an inner surface of the collet die and an outer surface of the dowel to define an internal neck diameter that is less than a maximum bullet diameter for a bullet configured to be loaded into the ammunition cartridge.
A method for uniformly forming a polymer-based ammunition cartridge neck of a polymer-based ammunition cartridge, the method comprising:
- providing a neck sizer, the neck sizer having a housing enclosing a collet die with a plurality of flutes, an upper stopper removably engaged about an outer surface of the collet die, a dowel extending through the upper stopper and into the collet die, and an external lock removably engaged to an upper end of the house;
- aligning the cartridge neck below the neck sizer;
- pressing the cartridge into the neck sizer so that the cartridge neck abuts an upper end of the collet die;
- and
- wherein the pressing of the cartridge into the neck sizer compresses the cartridge neck between an inner surface of the collet die and an outer surface of the dowel to extrude excess polymer material from the cartridge neck through the plurality of flutes forming a plurality of external ribs.
Dependencies are inferred from the claim text.