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Weapons designed to adequately stabilize both the M193 or SS109 projectiles (like civilian market clones) usually have a six-groove, right-hand twist, one turn in 9 inches (1:228.6 mm or 41.1 calibers) or one turn in 8 inches (1:203.2 mm or 36.5 calibers) bore, although other and 1:7 inches twist rates are available as well.
The rifling twist rate for this cartridge is 177.8 mm (1 in 7 in), 6 grooves right hand twist, Ø lands = 5.56 millimetres (0.219 in), Ø grooves = 5.69 millimetres (0.224 in). [ 6 ] According to STANAG 4172 and the official NATO proofing guidelines the 5.56×45mm NATO case can handle up to 420.0 MPa (60,916 psi) piezo service pressure.
1:14: 1 right hand twist every 14 inches (356 mm) .222 Remington or .223 Remington (US M193) 1:12: 1 right hand twist every 12 inches (305 mm) .223 Remington (US M193) or 7.62×39mm; 1:10: 1 right hand twist every 10 inches (254 mm) 9×19mm NATO; 1:9: 1 right hand twist every 9 inches (229 mm) .223 Remington & 5.56×45mm NATO
If a 5.56×45mm NATO cartridge is loaded into a chamber intended to use .223 Remington, the bullet will be in contact with the rifling and the forcing cone is very tight. This generates a much higher pressure than .223 Remington chambers are designed for. [3] NATO chose a 178-mm (1-in-7) rifling twist rate for the 5.56×45mm NATO chambering.
It also has the fastest rifling twist ratio for the .223 Remington of the three models(1:9 instead of 1:12). Early production rifles had a 1:12 twist rate and post-2014 rifles have the 1:9 twist rate. [2] The CZ 527 Varmint in .223 has muzzle velocities for standard-load 45-grain (2.9 g) ammunition of around 3,500 feet per second (1,100 m/s).
The .223 WSSM was introduced in 2003 by the Browning Arms Company, Winchester Ammunition, and Winchester Repeating Arms Company. The .223 designation is a reference to the popular .223 Remington. It is currently the fastest production .22 caliber round in the world with muzzle velocities as high as 4,600 feet per second (1,402 meters per second).
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0.405 [5] 56.72mm Same cartridge as .244 Remington and interchangeable. Rifles marked .244 Remington may not stabilize heaviest 6mm Remington bullets. [3] 6mm BR Norma: 1996 [14] Sweden 3 [15] [16] R 6x39.6mm 2789 [15] 0.243 0.517 [15] 39.6mm Norma's redesigned of the Remington 6mm BR in order to utilize VLD bullets. 6mm XC: 2000 US 4 [17] [18 ...