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The .24 caliber (6 mm) cartridge version became known as the 6mm Bench Rest or the 6mm BR due to its widespread use in the sport of bench rest shooting. Because the cartridge was a wildcat and was not standardized until several years later, several variations of the cartridge existed.
This is a list of firearm cartridges which have bullets of a caliber between 6 millimetres (0.236 in) and 6.99 millimetres (0.275 in). Length refers to the cartridge case length; OAL refers to the overall length of the cartridge; Measurements are in millimeters then inches, i.e. mm (in).
6 mm XC diagram in Inches. The 6XC is a 1000-yard cartridge, comparable to benchrest calibers such as 6x47mm Swiss Match, 6.5×47mm Lapua and 6 mm/22-250; it fits into cartridge class that exceeds the velocities of benchrest calibers such as 6mm BR Remington, 6mm BRX and 6mm Dasher. David Tubb has claimed several wins with the 6XC in NRA High ...
32 gauge — .526 in (13.4 mm) 28 gauge — .550 in (14.0 mm) 24 gauge — .579 in (14.7 mm) 20 gauge — .615 in (15.6 mm) 16 gauge — .663 in (16.8 mm) 14 gauge — .693 in (17.6 mm) 12 gauge — .729 in (18.5 mm) 10 bore — .775 in (19.7 mm) 8 bore — .835 in (21.2 mm) 6 bore — .919 in (23.3 mm) 4 bore — 1.052 in (26.7 mm)
6mm Creedmoor.257 Roberts; 6.5×51 NATO (wildcat) 7.62×51mm NATO necked down to 6.5 mm w/ 30-degree shoulder & .287" neck length. Wild Monkey; 6.5×47mm Lapua; 6.5mm Creedmoor.260 Remington; 6.5 WSM (wildcat).270 Winchester Short Magnum.277 Fury; 7mm-RPC (wildcat) 7mm SAUM neck location 30° shoulder .308 Brass, "7mm Rum Punch Colonial". Wild ...
The 6mm Creedmoor is a necked-down version of the 6.5mm Creedmoor using 6 mm (.243 inch) bullets, lighter than 6.5 mm bullets with similarly reduced recoil. [31] John Snow at Outdoor Life built a 6mm Creedmoor rifle in 2009 for a magazine article of the wildcat cartridge that appeared in 2010, but the first documented conception of the 6mm ...
O ratio is also used to predict barrel life in cartridges of the same caliber, but not of different calibres, since the ratio is an extensive quantity that does not correlate to temperature or pressure (e.g. a .50 cal straight cartridge may have the same overbore as a highly necked down .17 cal cartridge).
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. To obtain maximum accuracy, bullet weight and form are matched to the rifling twist rate of the barrel. Typically, 68 gr (4.41 g) bullets are used in barrels with twist rates of 1 in 13 ...