Patent ID: 6354221
Filing Date: 2002-03-12
Classification: F41A,F42B

Abstract:
A firearm cartridge having a projectile within a range from 0.224 to 0.458 caliber and an elongate tubular case capable of withstanding internal gas pressures of at least 50,000 psi, said cartridge having sufficient propellant to fire in a short-action firearm at an internal gas pressure of at least 50,000 psi and being manually extractable after firing, said case having a first end defining a substantially circular base with an annular rim and a second end defining a mouth for insertably receiving said projectile, said case having a first portion of substantially cylindrical shape adjacent to said first end and a second portion of a narrower substantially cylindrical shape adjacent to said second end, and a frusto-conical shoulder portion interconnecting said first portion and said second portion, said case having an overall length extending between said first end and said second end, and said first portion having an outer case diameter of at least about 0.53 inch at a location 1.25 inches from said first end, said overall length having a ratio to said outer case diameter at said location of no more than about 4.2, said first portion having a first portion length extending between said first end and said shoulder portion, said first portion length having a ratio to said outer case diameter at said location of no more than about 3.33, said firearm cartridge being free of any protrusion extending radially outwardly beyond said cylindrical shape of said first portion of said case, said rim having an outer rim diameter substantially no less than said outer case diameter at said location so as to insure reliable bolt operation of the firearm.