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The .351 SL cartridge used an unusual bullet diameter of .351 instead of the .357 or .358 more commonly used in .35-caliber rifle cartridges. [6] Most ammunition available today for the .351 SL is produced by a few boutique manufacturers, often using either cast lead bullets or copper-plated bullets or, occasionally, .358 jacketed bullets ...
Therefore, recoil-operated firearms work best with a cartridge that yields a momentum approximately equal to that for which the mechanism was optimized. For example, the M1911 design with factory springs is optimized for a 230-grain (15 g) bullet at factory velocity. Changes in caliber or drastic changes in bullet weight and/or velocity require ...
Armor-piercing (AP): A hard bullet made from steel or tungsten alloys in a pointed shape typically covered by a thin layer of lead and or a copper or brass jacket. The lead and jacket are intended to prevent barrel wear from the hard-core materials. AP bullets are sometimes less effective on unarmored targets than FMJ bullets are.
The .450 Rigby was designed primarily to harvest heavy, thick-skinned dangerous game animals in Africa. When hunting such game, it is important to consider the velocity rating of the bullets utilized. The .450 Rigby is capable of exceeding the range of velocities within which many .458 caliber (11.6 mm) bullets are designed to function.
Caliber/calibre: In small arms, the internal diameter of a firearm's barrel or a cartridge's bullet, usually expressed in millimeters or hundredths of an inch; in measuring rifled barrels this may be measured across the lands (.303 British) or grooves (.308 Winchester) or; a specific cartridge for which a firearm is chambered, such as .45 ACP or .357 Magnum.
The minimum power factor rule is designed to mitigate the speed and accuracy advantages of smaller calibers. Less-powerful cartridges have less recoil, and therefore can be fired more quickly with the same accuracy. Setting a minimum power factor value requires recoil management skills by all competitors.
The normal factory load consists of a 200 grain round-nosed bullet with a muzzle velocity of 2080 feet per second. This 200 grain bullet is nearly 18% heavier than the .30-30's 170 grain bullet, and has a 16% larger frontal area. This gives it a substantial increase in power over the .30-30, especially when used on larger game species.
James H. Sutherland, who over the course of his life shot between 1,300 and 1,600 elephants, used a .318 Westley Richards along with a .577 Nitro Express double rifle for all his African hunting, in a letter to Westley Richards he wrote "In open country, against Elephants and Rhinoceroses where the quarry is difficult to approach and long shots ...