Other

Superior Ballistics, Inc.

Michael Lee McPherson

Robert B Smalley, Jr

Ken Markle

Martin Wanninger

A bullet-seating die for precisely loading a bullet into a cartridge case is disclosed. In embodiments, the bullet die comprises: a die body; means for controlling seating depth of the bullet in the cartridge case; means for positively centering the bullet in the die body; means for positively centering a front end and base of the cartridge case in the die body; means for seating the bullet by engaging an ogival portion of the bullet that will engage a rifling as the bullet moves into a bore when a loaded cartridge is fired; and means for releasing the seated bullet from the seating means.

Collet bullet-seating die

A bullet-seating die for precisely loading a bullet into a cartridge case is disclosed. In embodiments, the bullet die comprises: a die body; a bullet-nose-alignment stem configured to engage and center a front end of a bullet within the die body before and after bullet seating begins; a bullet-seating-depth-adjustment screw adjustable to control seating depth of the bullet in a cartridge case; a bullet-seating collet configured to surround an ogival portion of the bullet that will engage the rifling when the loaded cartridge is fired; a bullet-seating collet bushing configured to positively center the bullet-seating collet in the die body; a case-shoulder-alignment bushing configured to positively center a front end of the cartridge case, the bullet-nose-alignment stem, and the bullet-seating collet bushing along the axis of the die body during bullet seating; and a case-base-alignment bushing configured to positively center a base of the cartridge case in the case-shoulder-alignment bushing.

A firearm cartridge has a case configured with a relatively straight-walled portion and a shoulder portion for housing a quantity of propellant. The case further includes a neck for retaining a bullet. The straight-walled portion defines a base cavity having an interior base diameter. The interior base diameter is approximately twice or more the neck diameter. The diameter ratios of the base and neck optimize combustion efficiency to reduce heat and acceleration losses. The cartridge body cavity is sized and configured to contain a sufficient quantity of propellant such that igniting the propellant causes formation of a propellant plug having a diameter that is approximately the diameter of the bullet, and wherein the propellant plug shears free from unburned propellant that is disposed adjacent the relatively straight-walled body portion.

Firearm cartridge and case-less chamber

A firearm cartridge has a case configured with a straight-walled portion and a radial shoulder for housing a propellant. The case further includes a neck for retaining a bullet. The straight-walled portion defines a base cavity having an interior base diameter. The interior base diameter is approximately twice or more the neck diameter. The diameter ratios of the base and neck optimize combustion efficiency to reduce heat and acceleration losses. The radial shoulder focuses a shockwave below a bullet base to reduce heat loss to the bullet and support bullet retention in the neck for a longer period of time. A thermally insulating coating is utilized to reduce heat loss to the case or chamber and accelerate ignition of the propellant.

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Cortez, CO, United States of America

Michael Lee McPherson