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The 6.5-284 has been used extensively in benchrest competitions and is known as an extremely accurate long range round. Using an improved version of the 6.5-284, Rich DeSimone set a 1,000-yard (914.4 m) world record with a 1.564-inch (39.73 mm) group. [4]
The .338 Norma Magnum was originally developed as a long-range sport shooting wildcat cartridge by the American sport shooter Jimmie Sloan with the help of Dave Kiff, owner of Pacific Tool and Gauge, who made the reamers and headspace gauges. Barrels were supplied by Rock Creek Barrel Inc. Various twist rates were tried with 5R rifling.
Distance between lands is .450-inch (11.4 mm) and between grooves is .458-inch (11.6 mm). Recommended rifling twist rate for this cartridge is 1-14 in. Since Lott was an influential big-game hunter and writer the cartridge gained some attention with professional hunters in Africa.
DuPont at one time shipped DuPont No. 4350 powder to Norma Projektilfabrik for the reloading of Weatherby ammunition. But some time later Norma was able to source a powder with similar burn characteristics locally which was used instead of DuPont's IMR 4350. [6] Norma would later purchase the company and rename the powder Norma 204.
Number of manufacturers producing complete cartridges - e.g. Norma, RWS, Hornady, Winchester, Federal, Remington, Sellier & Bellot, Prvi Partizan. May be none for obsolete and wildcat cartridges . H/R: Handgun (H) or rifle (R) - dominant usage of the cartridge (although several dual-purpose cartridges exist)
The .358 Norma Magnum is a rifle cartridge introduced in 1959 by Norma. The cartridge is closely related to the .308 Norma Magnum and both cartridges share the same case head dimensions as the .300 H&H Magnum , but have far less body taper, resulting in the same internal capacity in a shorter case. [ 1 ]
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Several ammunition makers like Kynoch, Norma, Federal, and Hornady are offering .404 Jeffery sporting ammunition. [citation needed] A more recent development by Norma of Sweden has been the introduction of 450 gr ammunition under their African PH banner. The increase in bullet weight and sectional density improves the ballistics of the .404 ...