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By necking down the .300 RUM to suit the .284 or 7mm projectile, Remington produced a non-belted case with a head diameter that is somewhat larger than the belt diameter of the original belted numbers. The resulting case has significantly more capacity than any conventional belted magnum.
With heavier bullets the .240 Wby. Mag. makes for a good deer hunting cartridge, but it does tend to require a long (>23 inches (580 mm).) barrel in order to achieve peak performance. Performance for 100 grain bullet from utilizing a factory 26" test barrel and a Nosler Partition bullet)
The 5.6×39mm, also known in the U.S. as .220 Russian, is a cartridge developed in 1961 for deer hunting in the USSR. [3] It fires a 5.6mm projectile from necked down 7.62×39mm brass. While it originally re-used 7.62x39 cases, once it became popular enough commercial ammunition started being manufactured, both in the USSR and in Finland.
A .257 bullet has a metric bullet diameter of 6.53 mm. However, in Europe cartridge designation nomenclature for a large part relies on the bore diameter. As the bore diameter of the .257 Weatherby Magnum is .250 inches this would make it a 6.35 mm caliber cartridge which uses 6.5 mm bullets (not to be confused with 6.5 mm caliber cartridges ...
The round is optimised for bullets heavier than 100 grains to improve performance at long ranges - .243Win typically uses bullets lighter than 100 grains. [4] It is touted as being one of the most accurate long-range 6 mm rounds in the world that is designed for repeating rifles. [citation needed] The 6XC is now a CIP standardized case. [5]
Lighter dangerous game such as leopard and lion are best served with lighter bullets which open up rapidly or bullets which fragment upon impact such as the A-Square 400 gr (26 g) Lion Load. African countries require a minimum caliber of either .375 in (9.5 mm) or .400 in (10.2 mm) for the hunting of dangerous game.
The .475 Linebaugh is intended primarily for hunting and defense against big game. The .475 is capable of propelling a 400-grain (26 g) bullet at a muzzle velocity of 1,400 feet per second (430 m/s), developing 1,741 foot-pounds (2,360 J) of muzzle energy from a 5.5" barrel.
Remington's decision to use a metric bullet may have been prompted by their past success with the 7 mm bore diameter. [ 3 ] Even though the 8mm Remington Magnum has never been very popular, it is a very suitable cartridge for the hunting of elk, moose, caribou, and larger African antelope.