High-power firearm cartridge

A cartridge for firing in a mating short-action firearm chamber, said cartridge having a projectile within a range from 0.224 to 0.458 caliber and an elongate tubular case, having a first end defining a substantially circular base with an annular rim and groove, capable of operably withstanding, and having sufficient propellant to fire at, an internal gas pressure of at least 50,000 psi when in said chamber, and being operably extractable manually after firing at said pressure, said case having 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 cartridge being free of any protrusion extending radially outwardly beyond said cylindrical shape of said first portion of said case.