Federal American Eagle Tactical Rifle Ammunition XM193C, 5.56 NATO (223 Remington), Full Metal Jacket Boat-Tail, 55 GR, 3165 fps, 20 Rd/bx

FEDERAL CARTRIDGE CO Centerfire Ammo

5.56mm., 55 Grain, Full Metal Jacket Boat Tail

XM193 product is first run, first quality product manufactured at Lake City Army Ammunition Plant for Federal Cartridge and is made to Federal specifications typical for commercial ammunition.

SPECIFICATIONS:
MANUFACTURER NO.: XM193C PACKAGING: 20 Round Black American Eagle Tactical Box CALIBER: 5.56 mm, manufactured at the Lake City Army Ammunition Plant (LCAAP)
CASE: Brass (Copper Alloy No. 260)
BULLET: 55 gr. FMJ Boat-Tail
PRIMER: M41 Operating Range: (-40 degrees to +125 degrees F)
PRIMER SEALANT: Water resistant lacquer
CASE MOUTH SEALANT: Yes
CASE KNURL: No
HEADSTAMP: Each loaded cartridge shall be headstamped with the manufacturer's symbol and year of manufacture
ACCURACY: 3-10round groups not to exceed 2.00" mean radius maximum average at 200 yards
INSTRUMENTAL VELOCITY: 3165 +/- 40 FPS (78 feet from muzzle) using a 5.56 test barrel, 20" long
ENERGY: 1223 Ft-Lbs. at 78’
CHAMBER PRESSURE: Piezotronic maximum average per 10 rounds - 55000 PSI in 5.56 test barrel (case mouth location)
BULLET PULL: Minimum individual 35 lbs.
PROPELLANT DETECTION: 100% mechanical/electronic detection of propellant levels within the cartridge
VISUAL INSPECTION: 100% visual inspection of finished cartridges prior to packaging
WARNING: For use in standard 5.56 mm chambers. Do not use in non-standard 5.56 chambers.

Ballistics Table:

While, .223 and 5.56 x 45 ammo are interchangeable, the 5.56 may be loaded at higher pressures than .223. SAAMI warns not to use 5.56 ammo in sporter 223 rifles

SAAMI points out that chambers for military rifles have a different throat configuration than chambers for sporting firearms which, together with the full metal jacket of the military projectile, may account for the higher pressures which result when military ammunition is fired in a sporting chamber.

SAAMI recommends that a firearm be fired only with the cartridge for which it is specifically chambered by the manufacturer. The .223 Remington is rated for a maximum of 50,000 CUP while the 5.56mm is rated for 60,000 CUP. That extra 10,000 CUP is likely sufficient to cause a failure in a chamber that's only rated for the "sporting" .223 Remington.