The Winchester M193 5.56x45mm NATO 55gr FMJ (brand part no. WM193500) is a bulk 500-round box of ammunition built to the U.S. military’s M193 ball specification, the standard that defined 5.56mm training and range performance. Winchester loads the 55-grain full metal jacket in brass cases for reliable extraction and reloading compatibility, keeping the mil-spec designation without the mil-contract price. Among rifle ammunition, this bulk box favors 5.56 shooters who want a proven military-spec loading on hand for high-volume training.

Key Specifications

• The chambering is 5.56x45mm NATO, loaded to the M193 ball specification.
• The bullet weighs 55 grains, the standard M193 weight.
• The bullet is a full metal jacket (FMJ), built for reliable feeding rather than expansion.
• The M193 designation is the U.S. military ball-ammunition spec widely used for training and range work.
• The cases are reloadable brass.
• This listing is a single 500-round box.

Frequently Asked Questions

Is this safe to shoot in a .223 Remington rifle? This is a 5.56x45mm NATO M193-specification load. It is safe in rifles chambered in 5.56 NATO or .223 Wylde, but it is not recommended in rifles chambered specifically in .223 Remington, which are built for lower pressure.

What is M193? A U.S. military ball-ammunition designation for 55-grain 5.56mm FMJ, widely used as a training and range spec.

How many rounds come in this box? This listing ships a single 500-round box.

Buy the Winchester M193 5.56 NATO 500-Round Box

M193 is the benchmark 5.56 training spec for a reason, and this box delivers that proven loading at a bulk price. Order from our Lubbock, Texas gun shop and it ships fast to your door.