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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 .284 Winchester has 4.29 ml (66 grains H 2 O) of cartridge case capacity. The case has a rebated rim and a body almost as large in diameter as that of typical belted magnum cases. .284 Winchester maximum C.I.P. cartridge dimensions All sizes in millimeters (mm). [3] Americans would define the shoulder angle at alpha/2 = 35 degrees.
6,5 G.A.P. 4S [16] 6.71 (.264) 51.18 (2.015) 13.56 (.534) 14.00 (.551) 13.58 (.535) 7.42 (.292) 76.30 (3.004) 6.5 Weatherby Rebated Precision Magnum [17] 6.71 (.2640) 65.3 (2.570) 12.0 (.473) 12.70 (.5000) 12.04 (.4739) 7.49 (.2950) 84.8 (3.340) 6.5 Precision Rifle Cartridge [18] 6.716 (.2644) 51.56 (2.030) 13.51 (.532) 13.513 (.5320) 13.101 ...
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The 6.5mm Creedmoor designated as 6.5 Creedmoor by SAAMI, and as 6,5 Creedmoor by the C.I.P. [ 4 ] is a centerfire rifle cartridge introduced by Hornady in 2007. [ 6 ] It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.
The 6mm XC was initially developed as a Wildcat cartridge specifically for NRA High Power match shooting by 11-time US National Champion David Tubb. [2] [3] The round originated from chambering a barrel using a .243 Winchester reamer held short, with the case reformed from .22-250. [2]
The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
The .280 Ackley Improved (.280 AI) was the result of the .280 Remington case modification by P.O Ackley, who pushed out the sidewalls at the shoulder to near parallel and steepened the shoulder angle to 40 degrees in order to increase powder capacity, thus along with increasing the allowable pressure, resulted in increasing the bullet initial velocity by approximately 100 fps.
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