Winchester USA Ammunition 5.56x45mm NATO 62 Grain M855 SS109 Penetrator Full Metal Jacket

Winchester USA 5.56x45mm NATO ammunition delivers the reliable performance and value that AR platform shooters and military rifle users have come to expect from one of America's most trusted ammunition makers. This 62-grain M855 SS109 load is the classic NATO-spec round that's become the standard for everything from range training to duty use, and Winchester's USA line makes it accessible without compromising on consistency.

The M855 projectile is a full metal jacket design with a steel penetrator core, built to perform against a variety of targets and conditions. With a muzzle velocity of 3060 fps and muzzle energy of 1289 ft-lbs, this round delivers the ballistic characteristics shooters have relied on for decades. Whether you're zeroing an optic, running drills at the range, or maintaining proficiency with your rifle, the 5.56 NATO 62-grain is the workhorse round that won't let you down—and at 1000 rounds per box, you can stock up for serious training volume without breaking the bank.

Winchester USA ammunition is manufactured to exacting standards, so you get the same attention to quality and safety that defines the brand, even at bulk pricing. The White Box line represents straightforward, no-nonsense ammunition: consistent ignition, reliable feeding, and predictable performance. This is the ammo you can trust to show up the same way every single time you pull the trigger.

Key Features

• M855 SS109 NATO-spec design with steel penetrator core
• Full metal jacket construction for reliable feeding and consistent performance
• 1000-round box supports high-volume training and practice
• 3060 fps muzzle velocity for proven 5.56 NATO ballistics
• Winchester quality control and consistency at accessible pricing

Specifications

Frequently Asked Questions

What rifles will fire Winchester USA 5.56 NATO ammunition?

This 5.56x45mm NATO round is compatible with any rifle chambered in 5.56 NATO or .223 Remington, including AR-15 platforms, M16 variants, and other NATO-spec rifles. Always verify your rifle's chamber and consult your firearm's manual.

Is the M855 round legal for hunting?

Ammunition legality varies by state and local jurisdiction, especially regarding hunting applications. Check your local game and fish regulations before using any ammunition for hunting purposes.

Can I use this 5.56 NATO ammo for target practice and range shooting?

Yes, Winchester USA 5.56 NATO is well-suited for range training, target practice, and high-volume shooting sessions. The 1000-round box is designed for serious shooters who put in consistent trigger time.

What's the difference between the 62-grain M855 and lighter 55-grain 5.56 loads?

The 62-grain M855 is heavier than standard 55-grain 5.56 rounds, which affects trajectory, velocity, and impact characteristics. The 62-grain is the NATO military specification and tends to perform differently in terms of velocity and energy—check your rifle's manual and test at the range to see what works best for your needs.