Winchester USA .223 Remington 55-grain FMJ ammunition (brand part no. W2231000), sold by the full case, is centerfire rifle ammo built for exactly the job it advertises: training and extended range sessions without drama. Winchester engineers this load for positive functioning and good practical accuracy through semi-automatic rifles, with a full metal jacket bullet that will not expand and brass cases that resist leading during a long day of shooting. For shooters who put hundreds of rounds downrange in a single trip, this case of rifle ammunition is built to keep up.

Key Specifications

• The chambering is .223 Remington, loaded to SAAMI commercial specification.
• The bullet weighs 55 grains, the standard training weight for this cartridge.
• The bullet is a full metal jacket, built for positive functioning and no expansion through repeated cycling.
• Cases are brass, resisting the barrel leading that some cheaper loads cause over long sessions.
• The load is engineered for good practical accuracy, holding a consistent zero through extended range use.
• Each case holds a full 1,000 rounds, sold as a complete case rather than single boxes.

Frequently Asked Questions

Is this compatible with 5.56 NATO chambers? Yes — as a .223 Remington-spec load it is safe in rifles chambered for .223 Remington, .223 Wylde, and 5.56 NATO.

Will this run reliably in a semi-automatic AR-15? Yes, Winchester engineers this load specifically for positive functioning through semi-automatic actions.

Is a 1,000-round case a better value than individual boxes? Buying by the case keeps the cost per round consistent and saves reordering during a heavy training season.

Buy the Winchester USA .223 Remington 55gr FMJ Case

Extended range sessions expose ammo that cuts corners, and this Winchester USA case is built to run all day without a hiccup. Stack up practice reps, dial in your rifle, and let the case handle the reordering for you. Order from our Lubbock, Texas gun shop and it ships fast to your door.