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The cartridge is a necked-up version of the .22 PPC which is in turn based on a .220 Russian (5.6×39mm). [5] The standard bullet diameter for 6 mm caliber cartridges is .243 inches (6.2 mm), the same diameter used in the .243 Winchester and 6mm Remington cartridges.
As with most firearm cartridges, the .45 BPM can be loaded in a variety of configurations. A minimal 40 grain load of black powder is recommended as this is the upper limit of the .45 Colt cartridge. However, this does not necessarily preclude the use of smaller black-powder loads.
In the modern day, it is used for Black Powder Cartridge Rifle competitions. [1] While various bullet weights were used, a typical load for the .45-90 was a powder charge 90 grains (5.8 g) gunpowder (black powder) with a bullet weighing 400 grains (26 g). Such a load would have had a muzzle velocity of around 1,300 ft/s (400 m/s).
To put lock time and bullet dwell time in perspective; the lock time of most conventional bolt action rifles varies between 2.6 and 9.0 milliseconds, while after cartridge ignition most rifle bullets travel through a high powered rifle barrel bore in 1.0 to 1.5 milliseconds. Mechanical bolt-action rifle trigger systems with a sub 2.0 ...
Before testing was to be conducted, very thorough measurements of the rifle were taken so as to provide a benchmark for the testing which was to be undertaken. [7] The first test was conducted using a 180 gr (12 g) bullet propelled by 82 gr (5.3 g) of Du Pont #4350 powder. This load provided 65,000 psi (4,500 bar) of pressure.
The .577 BPE originated around 1870 with the 2 1 ⁄ 2-inch variant. [1]The 3-inch cartridge has survived to the current day as the .577 Nitro for Black, the same cartridge loaded with mild loadings of modern smokeless powder, carefully balanced through trial to replicate the ballistics of the Black powder version.
These loads were eventually dropped due to a combination of safety concerns, and newer smokeless powder rifle cartridges that offered even higher velocities, such as the .30-30 Winchester. [ 2 ] The first modern smokeless powder cartridge deliberately loaded by a major manufacturer to higher than standard pressure was the .38 ACP , originally ...
The .30-378 Weatherby Magnum is a .30 caliber, belted, bottle-necked rifle cartridge. [2] The cartridge was developed in response to a US Army military contract in 1959. While still unreleased to the public, the cartridge went on to set world records for accuracy including the first ten 10X in 1,000 yards (910 m) benchrest shootin