Winchester USA 5.56 NATO 55gr FMJ Ammunition /1000

Winchester USA 5.56 NATO 55gr FMJ Bulk Ammunition /1000

Features
Caliber: 5.56 NATO
Bullet Type: Full Metal Jacket
Muzzle Velocity: 3240 fps
Muzzle Energy: 1282 ft lbs
Bullet Weight: 55 Grains
Brass Cases
Round Per Box: 1,000
Boxes Per Case: 1
MPN: WM1931000
Reloadable: Yes

About the Manufacturer
The company who brought to life "the Gun that Won the West" is the same company who today continues to supply sportsmen with the best sporting ammunition in the world.Founded in 1866, Winchester is one of the world's most widely recognized and respected brand names.

For more than 140 years, the name "Winchester" has come to mean many things to many people. To most folks it means ammunition and the Gun that Won the West. For many others, however, it also rekindles images of fine hand tools and cutlery, fishing tackle, the classic artwork and hunting traditions.

To encourage the preservation of wildlife habitat, Winchester is a major sponsor of conservation organizations such as Ducks Unlimited and Quail Unlimited. And it's a major backer of sporting clays and other clay target shooting games.

About the 5.56X45mm NATO Cartridge
The 5.56x45mm NATO (official NATO nomenclature 5.56 NATO) is an intermediate cartridge developed in the United States and originally chambered in the M16 rifle. Under STANAG 4172, it is a standard cartridge for NATO forces as well as many non-NATO countries. It is derived from, but is not identical to, the .223 Remington cartridge.

During the late 1950s, ArmaLite and other U.S. firearm designers started their individual Small Caliber/High Velocity (SCHV) assault rifle experiments using the commercial .222 Remington cartridge. When it became clear that there was not enough powder capacity to meet U.S. Continental Army Command's (CONARC) velocity and penetration requirements, ArmaLite contacted Remington to create a similar cartridge with a longer case body and shorter neck. This became the .222 Remington Special. At the same time, Springfield Armory's Earle Harvey had Remington create an even longer cartridge case then known as the .224 Springfield. Springfield was forced to drop out of the CONARC competition, and thus the .224 Springfield was later released as a commercial sporting cartridge known as the .222 Remington Magnum. To prevent confusion among all of the competing .222 cartridge designations, the .222 Remington Special was renamed the .223 Remington. With the U.S. military adoption of the M16 rifle in 1963, the .223 Remington was standardized as the 5.56x45mm NATO. As a commercial sporting cartridge the .223 Remington was introduced in 1964.

5.56 NATO Cartridge Specifications
Parent case .223 Remington
Case type Rimless, bottleneck
Bullet diameter 5.70 mm (0.224 in)
Neck diameter 6.43 mm (0.253 in)
Shoulder diameter 9 mm (0.354 in)
Base diameter 9.58 mm (0.377 in)
Rim diameter 9.60 mm (0.378 in)
Rim thickness 1.14 mm (0.045 in)
Case length 44.70 mm (1.760 in)
Overall length 57.40 mm (2.260 in)
Case capacity 1.85 cm3 (28.5 gr H2O)
Rifling twist 178 mm or 229 mm (1 in 7 in or 9 in, originally 1 in 14 in)
Primer type Small rifle
Maximum pressure (EPVAT) 430 MPa (62,366 psi)
Maximum pressure (SCATP 5.56) 380 MPa (55,114 psi)