Hornady Superformance 5.56x45mm NATO 55-grain CX (Copper Alloy eXpanding) ammunition (Hornady part no. 812544) gives AR-platform shooters a genuine velocity advantage without extra recoil or peak pressure. Hornady engineers Superformance around highly efficient propellants that accelerate the bullet longer than standard powders, delivering up to a 200 feet-per-second increase in muzzle velocity. That added speed produces flatter trajectories, less wind drift, and better energy transfer on impact for maximum terminal performance. The lead-free CX bullet is safe in semi-autos, lever guns, and pump actions alike, making this a versatile, high-performance option for 5.56 shooters.

Key Specifications

• The chambering is 5.56x45mm NATO / .223 Remington, the standard AR-platform cartridge.
• The bullet weighs 55 grains, a common, versatile weight for the caliber.
• The bullet is Hornady’s CX (Copper Alloy eXpanding), a lead-free, monolithic expanding design.
• The Superformance propellant boosts muzzle velocity by up to 200 feet per second over standard loads.
• Increased velocity produces flatter trajectories and less wind drift for improved accuracy.
• The load is safe in semi-autos, lever guns, and pump actions, a genuinely versatile option.
• The box measures about 4.5 inches in packaging length, sized for standard rifle-ammo storage.
• Cases are made of brass, giving reliable extraction and the option to reload.
• Each box holds 20 rounds, packaged 10 boxes to a case.
• At roughly $1.60 per round, this load is priced as a premium high-performance round.

Frequently Asked Questions

What makes Superformance faster? Hornady uses highly efficient propellants that accelerate the bullet longer without added peak pressure or recoil.

Is this bullet lead-free? Yes, the CX bullet is a monolithic copper-alloy design with no lead core.

Is this ammo safe in any AR-15? Yes, Superformance is engineered to be safe in semi-autos, lever guns, and pump actions.

Buy the Hornady Superformance 5.56x45mm 55gr CX

Get a genuine velocity advantage without changing how your rifle runs. Shop our rifle ammunition lineup and order from our Lubbock, Texas gun shop for fast shipping to your door.