Winchester USA 5.56x45mm NATO ammunition (part no. WM1931000) ships as a single 1,000-round case, built for AR-15 owners who would rather order once than restock every weekend. Winchester loads a 55-grain full metal jacket bullet over reloadable brass, giving handloaders a way to recover their brass even on a bulk training case. It is chambered to run in both 5.56 NATO and .223 Remington rifles, covering the huge installed base of AR-platform guns built around this cartridge. For shooters who train in volume and want to keep their brass, this case of rifle ammunition is built for exactly that.

Key Specifications

• This is loaded to 5.56 NATO specification, matching military ball ballistics.
• It is also compatible with rifles chambered in .223 Remington, covering both cartridge designations.
• The bullet weighs 55 grains, the standard training weight for this cartridge.
• The bullet is a full metal jacket, feeding reliably without expanding.
• Cases are brass and marked reloadable, letting handloaders recover and reuse them.
• This case is packed as a single 1,000-round bulk case, not stacked smaller boxes.
• The case measures roughly 12.65 x 6.8 x 6.1 inches, a compact footprint for storage.
• Buying the full case instead of single boxes lowers the effective cost per round.
• Cost runs about $0.60 a round, straightforward budgeting for a high-volume range day.

Frequently Asked Questions

Is the brass from this case reloadable? Yes, it is marked reloadable, so handloaders can recover and reuse the cases even from a bulk case purchase.

Will this run in a rifle chambered in .223 Remington? Yes, this load is spec’d for both 5.56x45mm NATO and .223 Remington chambers.

Does this ship as one case or several smaller boxes? It ships as a single 1,000-round bulk case rather than a stack of smaller boxes.

Buy Winchester USA 5.56x45mm 55gr FMJ Ammo

A single 1,000-round case means one order covers a serious training season, and reloadable brass means the value does not stop at the last round fired. Run your AR-15 hard and keep the brass for your next reloading session. Order from our Lubbock, Texas gun shop and it ships fast to your door.