The 50 Browning Machine Gun, sometimes known as the 50 BMG, is a 50 in (12.7 mm) caliber cartridge that was created for the M2 Browning heavy machine gun in the late 1910s and entered formal service in 1921. The machine gun was initially produced during World War I, and despite being cumbersome, the tank began to find its place on the battlefield—it was also resistant to most rifle and artillery shots.
The 50 BMG cartridge has a 290-gram capacity (19 g). The round is a scaled-up version of the 30-06 Springfield, but it has a case wall with a long taper to make feeding and extraction easier in different guns. This cartridge's rifling twist rate is 1 in 15 in (380 mm), with eight lands and grooves.
The 50 Browning Machine Gun is employed in anti-materiel rifles in addition to the M2 Browning heavy machine gun. There is a wide range of ammunition available, and match grade ammunition has boosted the use of 50 caliber rifles by allowing for more precise firing than lesser quality rounds. During WWII, the 50 BMG was principally utilized for anti-aircraft duties in the M2 Browning machine gun, both in its "light barrel" aircraft mount form and the "heavy barrel" (HB) version on ground vehicles.
Depending on the powder and bullet type, as well as the weapon from which it is shot, the 50 BMG round may create between 10,000 and 15,000 foot-pounds force (14,000 and 20,000 J). The 50 BMG's trajectory suffers less "drift" from cross-winds than smaller and lighter calibers due to the high ballistic coefficient of the bullet, making it an excellent option for high-powered sniper rifles.
The 408 Cheyenne tactical metric designation is a CheyTac 10.36 × 77mm. Also, it is a specialized rimless bottlenecked centerfire cartridge. Dr. John D. Taylor and Willam O. Wordman developed it. It has its place of origin in the United States and was designed in 2001. CheyTac USA LLC manufactures it. It has remained in production from the design year 2001, up till present day.
It is ammo for the military long-range sniper rifle and has a bullet diameter of 10.36mm. It possesses a neck of 11.12mm and has a shoulder of 15.24mm. It also has its rim diameter at 16.25mm, and with a rim thickness of 1.60mm, it boasts an overall length of 115.50mm with a rifling twist of 330.2mm. The .408 CheyTac Ammo has a maximum pressure of 440.00MPa.
With a bullet mass of 305gr, the .408 CheyTac Ammo travels at a velocity of 3,590 ft/s and delivers up to 11,247 joules of energy. A bullet mass of 419gr travels at 3,000 ft/s, and the energy delivered is 11,352 joules.
The .408 CheyTac Ammo delivers very accurate performance from a sniper rifle. It also has solid copper bullets. It has the least bullet drop amongst a family of sniper rifles. This is due to its superior aerodynamics. The .408 CheyTac Ammo's low drop makes it ideal for dispatching targets at very long ranges. In addition, it provides downrange performance, which is made possible by using a premium high BC projectile.
