Patent ID: 6550174
Filing Date: 2003-04-22
Classification: F41A,F42B

Abstract:
A short-action firearm having an elongate chamber and bolt assembly comprising a tubular chamber and a bolt, selectively slidable longitudinally in a sliding direction between a retracted unlocked position and an extended locked position, said bolt providing a locked bolt face when said bolt is in said locked position, said chamber having a first end adjacent to said locked bolt face and a second end defined by a case mouth recess sized for operably receiving a cartridge with a projectile of a specific caliber within a range from 0.224 to 0.458 caliber, said chamber being capable of withstanding internal gas pressures of at least about 65,000 psi and being sized to matingly engage said cartridge so as to enable said cartridge to fire in said chamber with sufficient propellant to produce an internal gas pressure of at least 50,000 psi and to operably withstand said pressure, said bolt being capable of inserting said cartridge into said chamber and operably extracting said cartridge manually therefrom after firing of said cartridge at said pressure, said chamber 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 chamber having an overall length measured from said locked bolt face to said second end of said chamber, said first portion having an inner chamber diameter at a location 1.25 inch from said locked bolt face of at least 0.53 inch, said overall length having a ratio to said inner chamber diameter at said location of no more than about 4.2, said first portion having a first portion length extending between said locked bolt face and said frusto-conical shoulder portion, said first portion length having a ratio to said inner chamber diameter at said location of no more than about 3.33, said chamber being sized for operably receiving a cartridge free of any protrusion on said cartridge extending radially outwardly beyond said cylindrical shape of said first portion of said chamber, said bolt having an extractor sized for operably gripping a rim portion of said cartridge having an outer rim diameter greater than 0.5 inch.