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Increasing freebore length in order to increase bullet jump is used to delay the onset of resistance from friction and deformation that results when the bullet engages the rifling. [9] Dimensions of freebore length and diameter may gradually increase as hot gas wears the interior barrel surface each time the weapon is fired.
For handgun cartridges, with heavy bullets and light powder charges (a 9×19mm, for example, might use 5 grains (320 mg) of powder, and a 115 grains (7.5 g) bullet), the powder recoil is not a significant force; for a rifle cartridge (a .22-250 Remington, using 40 grains (2.6 g) of powder and a 40 grains (2.6 g) bullet), the powder can be the ...
All bullet/cartridge combination are advertised with a muzzle velocity of 2470 ft/s (753 m/s) and muzzle energy of 8127 ft lbf (11019 J). In comparison: the parent cartridge, the .460 Weatherby Magnum as commercial loaded with a 500 gr (32.4 g) Monolithic Solid has a muzzle velocity of 2580 ft/s (786 m/s) and muzzle energy of 7389 ft lbf (10018 J).
The .505 Gibbs has a unique bullet diameter of .505 in (12.8 mm) while most other .50 caliber bullets have diameters of .510 in (13.0 mm). Barnes Bullets and Woodleigh Bullets are a few of the bullet manufacturers who produce component bullets for reloading in this caliber.
The .378 Weatherby Magnum was designed by Roy Weatherby in 1953. [3] [4] Although inspired by the .416 Rigby, it is an original belted magnum design with no parent case. [5]The cartridge features a high powder capacity relative to its bore size, and can hold upwards of 7.13 g (120 gr) of powder.
The rimless cartridge has a base diameter of 11.82 mm (similar to the 7.62×51mm NATO) and a case length of 47.72 mm. [2]. The bullet is an unusual 6.65 mm diameter (6.45mm refers to the bore diameter), fractionally smaller than the common 6.5 mm (bore diameter) bullet.
The cartridge and rifle were designed by the Atkinson & Marquart Rifle Co. of Prescott, Arizona, by necking up the then new .460 Weatherby Magnum to accept a .475 in (12.1 mm) diameter bullet. Fred N. Barnes, the founder of Barnes Bullets for whom the first rifle chambered for this cartridge was made, supplied the bullets. According to ...
bullet – optional – the diameter of the bullet used in the cartridge, expressed in mm or in; only include the number, and not the units of measurement, and omit any commas. land – optional – the land diameter of the rifling in the barrel, expressed in mm or in; only include the number, and not the units of measurement, and omit any commas.