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The US Army's Ballistic Research Laboratory measured a ballistic coefficient (G7 BC) of 0.151 and form factor (G7 i) of 1.172 for the SS109/M855 ball projectile. [36] The Swedish military has measured the bullet velocities of SS109/M855 military cartridges at 4 m (13.1 ft) from the muzzle fired from differing barrel lengths.
Using a ballistic calculator, they determined that a 55-grain bullet would have to be fired at 3,300 ft/s to achieve the 500-yard performance necessary. [8] Robert Hutton (technical editor of Guns and Ammo magazine) started the development of a powder load to reach the 3,300 ft/s goal. He used DuPont IMR4198, IMR3031, and an Olin powder to work ...
The minimum proof and performance requirements for small arms ammunition of NATO calibres are covered in STANAGs as follows: [7]. 5.56 mm. STANAG 4172 and NATO Manual of Proof and Inspection AC/225 (LG/3-SG/1) D/8.
The Taylor KO factor multiplies bullet mass (measured in grains) by muzzle velocity (measured in feet per second) by bullet diameter (measured in inches) and then divides the product by 7,000, converting the value from grains to pounds and giving a numerical value from 0 to ~150 for normal hunting cartridges.
v 0 is difficult to measure, so a second concept has been developed in ballistic testing called the ballistic limit (v 50). This is the velocity at which 50 percent of the shots go through and 50 percent are stopped by the armor. US military standard MIL-STD-662F V50 Ballistic Test define a commonly used procedure for this measurement.
Bill Wylde of Greenup, Illinois, compared the two cartridges and changed the chamber of the rifle's barrel to a specification he called the .223 Wylde chamber. The chamber is made with the external dimensions and leade angle found in the military 5.56×45mm NATO cartridge and the 0.2240 in (5.69 mm) freebore diameter found in the civilian SAAMI.
The Heckler & Koch HK416 is an assault rifle chambered for the 5.56×45mm NATO cartridge.It is designed and manufactured by the German company Heckler & Koch.. Although the design is based on the AR-15 class of firearm (specifically the Colt M4 carbine family issued to the U.S. military), it uses a proprietary short-stroke gas piston system from Heckler & Koch's earlier G36 family of rifles.
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 ...