223 (5.56) Ammo
.223 Remington ammunition and 5.56x45 NATO are closely related and sometimes interchangeable cartridges depending on the firearm they are to be used with. Manufacturers typically offer guidance on this point. In general, the 5.56 NATO ammunition the military uses and is for sale to the civilian market operates at higher pressures than .223 Remington ammo. Most, but not all, AR-15s are chambered for 5.56 NATO and can fire both types of ammo.
Many loads in both calibers follow the M193 or M855 standard, both of which are military specifications. M193 ammo typically fires a 55 grain full metal jacket bullet at 3,240 feet per second, while M855 ammo fires a heavier 62 grain FMJ bullet at about 3,100 feet per second. These common standards are very helpful when sighting in your optics and you'll find both cartridges in-stock and available in cheap bulk packs here at Widener's
Certain specialized loads deviate from these common standards. Competition grade .223/5.56 ammo fires a heavier bullet (most commonly a Sierra MatchKing) in the 77 grain range to provide better stability and more predictable trajectories; varmint loads, on the other hand, fire light 30-40 grain bullets at very high velocities to produce lethal fragmentation against pest animals.
One of the most sought after range loads for this caliber is Lake City ammunition, which is produced by Federal Premium Ammunition at the Lake City Army Ammunition Plant in Independence, Missouri. LCAAP production is typically excess from government contracts and is popular due to its military origins and high quality.
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Winchester 5.56x45 62 Grain FMJ M855 – 420 Rounds in Ammo Can
$374.85Product Type Ammo Manufacturer Winchester Condition New Bullet Weight 62 Grain Bullet Type Penetrator Use Type plinking at the range Casing Type Brass Quantity 420 Ammo Caliber 5.56x45mm Manufacturer SKU WM855420CS Primer Type Boxer Magnetic Yes UPC Barcode 20892229242 Cost Per Round 89.2¢ per round Ready for action! This ammo can contains 420 rounds of 5.56x45, loaded on stripper clips and accompanied by a handy steel spoon. Whether you want to pour the contents of this can into unsuspecting range targets or save them indefinitely, you can’t go wrong with Winchester’s military-grade 5.56x45.
This isn’t M193 ammo with 55 grain nonmagnetic FMJ projectiles. It is M855 ammo, with 62 grain magnetic FMJ projectiles. Each green-tipped bullet sports a seven-grain steel cone beneath the tip of its jacket, which promotes surer penetration of barriers including 0.125” thick steel plating at close to medium range. The M855 bullet’s relatively greater heft gives it superior velocities a few hundred yards out – a 1:7 barrel twist is adequate for this ammo, but you’ll observe its best accuracy with a 1:8 or 1:9 twist.
This Winchester 5.56x45 ammo is brand new production, not something that has been sitting around at an Army base for eons. As such it has responsive non-corrosive primers and newly minted brass cases. Don’t worry about the gray coloration around the cases’ mouths and necks – that’s only cosmetic, and the result of the annealing treatment which helps brass expand and contract more efficiently.