The Winchester USA M193 5.56x45mm NATO 55gr FMJ (Winchester part no. WM193KC) is a bulk rifle load sold as a 1,000-round case. It uses a 55-grain full metal jacket bullet in a brass case, and Winchester says modern propellants burn cleaner and reduce barrel fouling. The load is part of Winchester’s USA White Box line, which stands for consistent performance and value. It is made for range sessions, practice and training with AR-15 and other 5.56 rifles.

Key Specifications

• The cartridge is 5.56x45mm NATO, the military-standard round for AR-15 and M4-pattern rifles.
• Bullet weight is 55 grains, the M193 weight and a classic range load.
• The bullet is a full metal jacket, which suits range practice and training.
• The case is brass, which cycles reliably in a variety of firearms.
• The load uses modern propellants that burn cleaner and reduce barrel fouling.
• The listing is a 1,000-round case, sized for high-volume shooters.

Frequently Asked Questions

How many rounds are in this case? This listing is a 1,000-round case of 5.56x45mm NATO 55-grain FMJ.

Can I shoot 5.56 NATO ammunition in a .223 Rem rifle? It depends on the chamber. 5.56x45mm NATO runs at higher pressure than .223 Remington, and it is generally considered safe in 5.56 NATO and .223 Wylde chambers but not recommended in tight .223 Rem chambers.

What is the USA White Box line? Winchester describes USA White Box as consistent performance and outstanding value for range trips.

Buy the Winchester USA M193 5.56x45mm NATO 55gr FMJ, 1,000-Round Case

A 1,000-round case keeps your rifle fed through a lot of practice. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see more rifle ammunition while you are here.