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US 11,378,364 B2Granted
8mm cartridge
AssigneeVista Outdoor Operations LLC
InventorsBryan P. Peterson, Matthew S. Schroeder
Life of this patent
Estimating the term…
Abstract
Devices and methods for an 8 mm semiautomatic handgun cartridge providing a reduced form factor for carrying a greater number of rounds in a smaller space while maintaining ballistic performance.
Claims20
A semiautomatic 0.32 caliber cartridge, comprising:
- a rimless case comprising:
- a case length of about 0.827 in.,
- a flange diameter of 0.3380-0.3450 in.,
- an outer case diameter that tapers from a flange diameter of 0.3380-0.3450 in. to a case mouth diameter of 0.3370 in.,
- an intermediate case portion comprising a length of 0.500 in., a rear end outer diameter of 0.3425 in., and a forward end outer diameter of 0.3381 in.,
- an internal thickness taper portion that decreases in thickness toward the forward end of the cartridge, and
- a rear end comprising a groove and flange,
- a 0.32 caliber bullet seated in a case mouth at the forward end of the case and positioned forward of the internal thickness taper portion, the bullet comprising a weight of from 100 gr to 115 gr;
- a propellant in the case configured to provide a chamber pressure of about 50,000 psi;
- and
- a primer seated in the flange, the primer comprising a base thickness of from 0.0205 in. to 0.0225 in., a diameter of from 0.1745 in. to 0.1765 in., and a height of from 0.115 in. to 0.126 in.,
- the cartridge having a length of from 1.100 in. to 1.169 in.
9 more elements
A semiautomatic .32 caliber cartridge, comprising:
- a rimless case comprising:
- a case length of about 0.827 in.,
- a flange diameter of 0.3380-0.3450 in.,
- an outer case diameter that tapers from a flange diameter of 0.3380-0.3450 in. to
- a case mouth diameter of 0.3370 in.,
- an intermediate case portion comprising a length of 0.500 in., a rear end outer diameter of 0.3425 in., and a forward end outer diameter of 0.3381 in.,
- an internal thickness taper portion that decreases in thickness toward the forward end of the cartridge, and
- a rear end comprising a groove and flange,
- a 0.32 caliber bullet seated in a case mouth at the forward end of the case and positioned forward of the internal thickness taper portion, the bullet comprising a weight of from 100 gr to 115 gr;
- a propellant in the case configured to provide a chamber pressure of about from 32,000 psi to 52,000 psi;
- and
- a primer seated in the flange,
- the cartridge having a length of from 1.100 in. to 1.169 in.
10 more elements
A semiautomatic 0.32 caliber cartridge, comprising:
- a rimless case comprising:
- a case length of about 0.827 in.,
- a flange diameter of 0.3380-0.3450 in.,
- an outer case diameter that tapers from a flange diameter of 0.3380-0.3450 in. to a case mouth diameter of 0.3370 in.,
- an intermediate case portion comprising a length of 0.500 in., a rear end outer diameter of 0.3425 in., and a forward end outer diameter of 0.3381 in.,
- an internal thickness taper portion that decreases in thickness toward the forward end of the cartridge, and
- a rear end comprising a groove and flange,
- a 0.32 caliber bullet seated in a case mouth at the forward end of the case and positioned forward of the internal thickness taper portion, the bullet comprising a weight of from 100 gr to 115 gr, and length of from 0.562 in. to 0.9 in.;
- a propellant in the case configured to provide a chamber pressure of about 50,000 psi;
- and
- a primer seated in the flange, the primer comprising a base thickness of from 0.0205 in. to 0.0225 in., a diameter of from 0.1745 in. to 0.1765 in., and a height of from 0.115 in. to 0.126 in.,
- the cartridge having a length of from 1.100 in. to 1.169 in., wherein the internal thickness taper portion of the case extends only rearward of the bullet,
- the cartridge configured such that the muzzle velocity of the bullet fired from a pistol is between 1160 fps and 1350 fps, and the muzzle energy of the bullet fired from a pistol is between 344 and 405 ft-lbf.
10 more elements
Dependencies are inferred from the claim text.