Frontier Cartridge Military Grade 5.56x45mm NATO XM193 55 Grain FMJ-BT Ammunition

Frontier Cartridge Military Grade 5.56x45mm NATO XM193 55 Grain FMJ-BT ammunition is a versatile, American-made round built for shooters who demand reliability across multiple applications. Whether you're running high-volume range sessions, zeroing a hunting rifle, or training with an AR-platform gun, this straightforward FMJ load delivers consistent performance without the fuss. The 55-grain full metal jacket bullet is a proven design that feeds reliably, shoots clean, and works in pretty much any 5.56 NATO chamber you'll encounter.

These rounds come in brass cases with military-grade boxer primers—the kind of construction that lets you reload if you're so inclined, and that makes them suitable for function testing, duty training, or high-round-count practice days. Frontier Cartridge's reputation rests on state-of-the-industry loading and quality control, so you get the same reliable ignition and consistent velocities in round 500 that you got in round 1. No surprises, no flyers you can't explain.

The XM193 spec is the mil-surplus profile—a mil-standard load that's been proven in actual use for decades. It's not a match round, and it's not a premium hunting load, but it's exactly what it claims to be: dependable, affordable ammunition that handles training, practice, and general-purpose shooting without compromise. If you shoot 5.56 and you shoot a lot, Frontier keeps your ammunition can full without breaking the bank.

Key Features

• 55-grain full metal jacket-boat tail (FMJ-BT) bullet for reliable feeding and consistent flight
• Brass cartridge cases—reloadable and durable
• Military-grade boxer primers for dependable ignition
• American-made, built to established military specifications
• High-volume capable for training, range work, and function testing

Specifications

Frequently Asked Questions

Will this ammunition work in my AR-15 or 5.56 NATO rifle?

Yes. The XM193 specification is the standard military 5.56x45mm NATO load, and it will function in any rifle chambered for 5.56 NATO. It's a mil-spec round designed for broad compatibility across AR platforms and other 5.56 firearms.

Can I reload these brass cases?

Yes. The ammunition comes in brass cases with boxer primers, which is the standard setup for hand reloading. After firing, you can process, resize, reprime, and reload them as part of your reloading practice.

What's the difference between this and match-grade or premium hunting ammunition?

This is a no-frills, high-volume training and practice round. The 55-grain FMJ is proven and reliable but designed for function and value, not precision or specialized terminal performance. It's ideal for shooters who prioritize consistency and affordability for high round counts, not match-level accuracy or specific hunting applications.

Is this ammunition suitable for duty or defensive training?

Per the manufacturer's specifications, Frontier Cartridge loads this ammunition for law enforcement training applications, among others. However, for actual self-defense or duty use, consult your agency or training directive regarding approved ammunition specifications.