WINCHESTER, .223 Remington (5.56mm), Full Metal Jacket Bullet

WINCHESTER AMMUNITION: 

USA centerfire rifle ammo is the ideal choice for training or extended sessions at the range.

USA Full Metal Jacket:
Positive Functioning
No Expansion
Good Accuracy
No Barrel Leading

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

With the appearance of full metal jacket military 5.56 ammunition on the commercial market, it has come to the attention of the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI) that the use of military 5.56mm ammunition in sporting rifles chambered for Caliber .223 Remington cartridges can lead to higher-than-normal chamber pressures and possible hazards for the firearm, its user and bystanders. Tests have confirmed that chamber pressures in a sporting rifle may be significantly higher in the same gun when using military 5.56mm ammunition rather than commercially loaded Caliber .223 Remington cartridges, according to SAAMI.

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.

SPECIFICATIONS:
Mfg Item Num: Q3131
Category: AMMO CENTERFIRE
Caliber :5.56 NATO spec (223 Remington)
Bullet Type :Full Metal Jacket
Bullet Weight :55 GR
Muzzle Energy :1306 ft lbs
Muzzle Velocity :3270 fps
Rounds/box :20 Rounds Per Box, 50 Boxes Per Case

Note from SAAMI
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.
The .223 Remington and the 5.56mm NATO, when checked with a chamber ream from a reliable manufacturer of each, also have discernable differences in the areas of freebore diameter, freebore length and angle of the throat.

 Return to Factory Rifle Ammunition Page