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Source(s): Accurate Powder [1] The .221 Remington Fireball (5.7x35mm), often simply referred to as .221 Fireball , is a centerfire cartridge created by Remington Arms Company in 1963 as a special round for use in their experimental single-shot bolt-action pistol , the XP-100 . [ 2 ]
The default database however contains some errors, so measuring sizes, weights and case capacities of components intended for use and if appropriate correcting default provided data is wise to avoid surprises and make the predictions more accurate. Some default data is incomplete, since it was not released by the manufacturer or when components ...
Source(s): Reloading data at Accurate Powder Measured Drawing, 300 WSM 300 Winchester Short Magnum (also known as 300 WSM ) is a .30 caliber rebated rim bottlenecked centerfire short magnum cartridge that was introduced in 2001 by Winchester .
Source(s): Accurate Powders load guide v3.5 [1] Hodgdon powders achieve approx 100fps less. [ 2 ] The .300 Winchester Magnum (also known as .300 Win Mag or .300 WM ) (7.62×67mmB, 7.62x66BR) is a belted , bottlenecked magnum rifle cartridge that was introduced by the Winchester Repeating Arms Company in 1963.
Source(s): Reloading data at Accurate Powder The .300 H&H Magnum cartridge was introduced by the British company Holland & Holland as the Super-Thirty in June, 1925. [ 2 ] The case was belted like the .375 H&H Magnum , and is based on the same case, as also is the .244 H&H Magnum .
The .30-06 Springfield cartridge (pronounced "thirty-aught-six" / ˈ θ ɜːr t i ɔː t s ɪ k s /), 7.62×63mm in metric notation, and called the .30 Gov't '06 by Winchester, [5] was introduced to the United States Army in 1906 and later standardized; it remained in military use until the late 1970s.
Source(s): 308 Marlin Express LEVERevolution at Hornady web site and C.I.P Data [1] The .308 Marlin Express is a cartridge developed in 2007 by Marlin Firearms and Hornady . It is based on the .307 Winchester with a goal to duplicate .308 Winchester performance.
The .257 Roberts, also known as .257 Bob, [2] is a medium-powered .25 caliber rifle cartridge.It has been described as the best compromise between the low recoil and flat trajectory of smaller calibers such as the 5 mm (.22 in) and 6 mm (.24 in), and has more energy, but is harder recoiling, similar to larger hunting calibers, such as the 7 mm (.28 in) and 7.62 mm (.30 in).