| 摘要 |
<p> A firearm cartridge (110) has a case configured with a straight-walled portion and a radial shoulder (114) for housing a propellant. The case further includes a neck (20) for retaining a bullet (60). 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 (114) focuses a shockwave below a bullet base (66) 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.</p> |
