Winchester Super-X .223 Rem 55 gr 20rd

The Winchester Super-X .223 Rem 55 grain ammunition is a centerfire rifle cartridge offered in 20‑round boxes. It is intended for hunting and target shooting and is built on brass cases for consistent chambering and extraction. Published performance values list a muzzle velocity of 3240 fps and corresponding kinetic energy often cited for this load.

Key Specifications

• Caliber is listed as .223 Rem / 5.56 NATO in the provided product data.
• The bullet weight measures 55 grains.
• Listed muzzle velocity is 3240 fps.
• Listed muzzle energy is 1282 ft lbs.
• Each factory box contains 20 rounds.
• Boxes per case are listed as 10.
• Case material is specified as brass.
• Reloadable: Yes.
• Ballistic coefficient is recorded as 0.197 in the supplied data.
• Series designation in the source data is Centerfire Rifle.

For shooters who prefer a factory-loaded 55‑grain .223 for the range or field, this Super‑X offering provides consistent velocity, factory brass, and conventional handling characteristics. It is a straightforward choice for small-game hunting and precision practice where a common 55‑grain .223 load is desired.