Description
The Hornady Frontier .338 ARC brings serious subsonic capability to your AR-15 build. This 285-grain FMJ load gives you more downrange energy than you'd get from .300 Blackout subsonic, making it a great choice if you're upgrading from that platform or just want more authority in your subsonic setup.
Built for Suppressed Shooting and Training
Frontier ammunition is engineered with state-of-the-art manufacturing and quality control, using brass cases paired with military-grade primers and propellant. The 285-grain full metal jacket bullet cycles smoothly in semi-auto AR-15s and micro-bolt action rifles without requiring any modifications when you switch between suppressed and unsuppressed shooting. That consistency is what sets the .338 ARC apart from earlier subsonic offerings.
Real Subsonic Performance
Unlike .300 Blackout, the .338 ARC was designed from the ground up to excel at subsonic velocities. The cartridge itself is based on the 6.5 Grendel case, which is larger and holds more powder than standard AR-15 brass. That bigger case means you get better energy transfer, and the wider bullet diameter does more damage on target. You'll find the .338 ARC effective for hunting medium game like deer and hogs out to around 200 yards, plus target shooting, training exercises, and suppressed hunting scenarios. For close-range work, especially with a can on the rifle, this round punches way above its weight class.
What You Get
You're looking at 20 rounds per box of proven Hornady ammunition. The Frontier brand delivers the same quality control and consistency you'd expect from Hornady, just at a practical price point for regular use. Works great in AR-15 uppers chambered for .338 ARC that use Grendel-pattern magazines and bolts.
Key Specifications
- Caliber: .338 ARC
- Bullet Weight: 285 grains
- Bullet Type: Full Metal Jacket (FMJ)
- Load Type: Subsonic
- Rounds per Box: 20
- Case Type: Brass
- Manufacturer: Hornady
- Product Line: Frontier
- Manufacturer Part Number: FR430
- UPC: 090255729535
What’s Included
- 20 rounds of Hornady Frontier .338 ARC 285gr FMJ subsonic ammunition
Frequently Asked Questions
Will this .338 ARC ammo work in my .300 Blackout rifle?
No. .338 ARC requires a dedicated rifle chambered for that cartridge. The .338 ARC uses a different case dimension, bullet size, and magazine compatibility than .300 Blackout. You'll need a .338 ARC upper or complete rifle to shoot it safely.
Can I use these subsonic rounds suppressed and unsuppressed in the same rifle?
Yes. The .338 ARC is designed to cycle reliably with both suppressed and unsuppressed setups without any modifications to your rifle. You don't need adjustable gas systems or special tuning like some other subsonic cartridges require.
What's the effective range for this Frontier .338 ARC subsonic load?
For hunting medium-sized game, effective range is about 200 yards maximum. The subsonic velocity and bullet design mean this round performs best at closer ranges. For target shooting and training, you can stretch it out further depending on your shooting skill and optics setup.
Is 285 grains a good bullet weight for the .338 ARC?
Yes. The 285-grain FMJ sits between lighter range loads and heavier purpose-built hunting bullets, making it versatile for training and target work. Hornady also offers a dedicated 307-grain Sub-X for hunting applications if you need maximum terminal performance at subsonic speeds.




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