The 338 ARC cartridge has quickly become a standout choice for hunters and precision shooters using the AR-15 platform. Introduced by Hornady in 2021, it bridges the space between intermediate rounds and full-power cartridges while staying compatible with standard components.
Its design offers impressive energy retention and accuracy, making it effective for medium and large game or extended-range target shooting. Compared to many cartridges in its class, it delivers greater consistency and downrange performance without requiring an entirely new rifle system.
This guide breaks down the 338 ARC’s technical details, ballistic strengths, practical uses, and component considerations. You'll gain insight into how it stacks up against common alternatives and what configurations support its full potential.
From barrel setup to complete upper builds, you'll learn how to integrate the 338 ARC into your existing platform. AR15 Parts is also highlighted as a resource for components that align with this cartridge’s capabilities.
Explore 338 ARC Specifications and Design Advantages
The 338 ARC builds on the 6.5 Grendel case, necked up to hold .338-caliber projectiles. This design keeps it compatible with AR-15 magazines while delivering far more kinetic energy than most intermediate cartridges. This flexibility makes it appealing to shooters upgrading existing rifles.
Its 30-degree shoulder angle and AR-15–friendly overall length allow easy conversion. Shooters only need a compatible barrel and bolt, making the upgrade accessible without overhauling existing components. This minimizes cost and simplifies the transition process.
Hornady optimized the cartridge for bullets in the 160 to 230 grain range, with factory loads commonly using 200- and 230-grain options. Depending on barrel length, it reaches muzzle velocities between 2,200 and 2,400 feet per second.
These velocities generate more than 2,400 foot-pounds of muzzle energy, giving hunters the power needed for deer, hogs, and larger game when used within practical ranges. Its performance stands above many traditional AR-15 cartridges.
A focus on terminal performance and long-range capability sets the 338 ARC apart. Where other cartridges fade past 300 yards, it maintains ethical hunting energy out to roughly 500 yards when paired with proper optics and shooter skill.
Unlock Ballistic Performance and Proven Benefits
The 338 ARC offers distinct performance gains over other AR-15 cartridges. With a 230-grain bullet, it retains about 1,800 foot-pounds of energy at 300 yards. That surpasses the 6.5 Grendel at 1,400 and the 300 Blackout at 900 foot-pounds.
This additional energy improves terminal performance on game and increases effectiveness against barriers. Many shooters find that it delivers more reliable impact results in demanding hunting or tactical situations. Its power carries farther without sacrificing precision or control.
Wind resistance is another major advantage. High ballistic coefficients in 200-230 grain bullets help reduce wind drift and maintain steady trajectories. Shooters experience less holdover adjustment and predictability in shifting or challenging field conditions.
Moderate recoil also contributes to its appeal. Felt recoil is comparable to a .308 Winchester in a similarly weighted rifle. It remains manageable for follow-up shots and builds shooter confidence when accuracy and quick engagement matter.
A hunting outfitter in Texas reported remarkable success rates after switching several client rifles to 338 ARC configurations in 2023. The outfitter noted improved one-shot effectiveness on hogs and deer, with clients achieving ethical kills at ranges previously considered marginal for AR-15 platforms.
Choose Optimal Barrel Lengths for Maximum Results
Barrel selection plays a major role in 338 ARC performance. Length, twist rate, and profile all affect accuracy and velocity. Most shooters choose barrels between 12 and 20 inches based on intended use and handling needs.
The following barrel characteristics optimize 338 ARC performance:
- Length between 16-18 inches for balanced velocity and handling
- 1:8 twist rate for universal bullet weight compatibility
- Medium to heavy profile for thermal stability
- Quality steel construction with appropriate throat dimensions
- 5/8x24 threading for muzzle device compatibility
Shorter 12- to 16-inch barrels offer better maneuverability in dense cover and still perform effectively within 300 yards. They work well for mobile hunting setups where quick handling and compact form matter in the field.
For those seeking peak ballistic performance, 16- to 18-inch barrels deliver nearly full velocity potential while keeping overall rifle length manageable. The AR15 Parts lineup includes premium options built for both precise shooting and hunting applications.
Twist rates of 1:8 or 1:7.5 inches stabilize the full range of bullet weights from light varmint projectiles to heavy hunting loads. Medium to heavy barrel profiles improve heat management and withstand the cartridge’s higher pressure levels.
Select and Configure a Reliable Upper Assembly
Building or choosing a complete 338 ARC upper involves more than barrel selection. The bolt carrier group must use a 6.5 Grendel or 338 ARC bolt with correct headspacing. Standard 5.56 bolts will not work due to different case head dimensions.
Most reputable manufacturers include properly headspaced bolts in their complete upper assemblies. This ensures consistent function and safety during use. Reliable component integration reduces risk and streamlines the building process for new users and experienced builders alike.
Handguard selection should match the barrel profile while leaving clearance for accessories. Free-floating designs offer better accuracy potential by eliminating contact that can affect barrel harmonics. The 16" 338 ARC Complete Upper - Shaw Heavy Matte SS is a strong example of a well-constructed system.
Gas system tuning is especially important because the 338 ARC has a different pressure curve than the 5.56 NATO. Quality uppers come with appropriate gas ports and buffer weights. The 16" 338 ARC Upper - Ballistic Adv Hanson Premium Black Series showcases careful engineering and balanced performance.
Muzzle devices should address both recoil control and blast management. The larger bore diameter and increased powder charge create more blast than standard AR-15 cartridges. Effective brakes or flash hiders improve shooter comfort and support faster follow-up shots when needed.
Source and Select Effective Ammunition Options
The 338 ARC ammunition market has grown steadily since its launch, offering both factory-loaded rounds and components for reloaders. Hornady leads factory production with BLACK and Precision Hunter lines, each designed for specific shooting and hunting needs.
The BLACK line uses 230-grain A-MAX bullets for target shooting and tactical use, while Precision Hunter loads feature 230-grain ELD-X bullets built for controlled expansion and reliable performance in the field. These options give shooters flexibility based on the application.
Handloaders benefit from strong component availability across multiple manufacturers. Popular choices include Barnes TTSX, Nosler AccuBond, and Sierra MatchKing in 160 to 250 grain weights. Medium-burn-rate powders such as CFE 223, Lever Evolution, and Accurate 2520 support consistent performance.
The following ammunition types serve different applications effectively:
- 200-grain bullets for deer-sized game and medium-range precision work
- 230-grain bullets for larger game and maximum energy transfer
- 160-180-grain bullets for varmint hunting and reduced recoil applications
- Match-grade options for precision shooting and competition use
- Subsonic loads for suppressed applications, though performance is limited
Case life proves excellent with proper loading practices, as the 338 ARC operates at moderate pressures that don't overstress brass components. Most handloaders report 8-10 reloadings per case with careful preparation and appropriate powder charges.
Apply the 338 ARC in Real-World Scenarios
The 338 ARC excels in various applications where its performance provides clear benefits over other AR-15 cartridges. Medium game hunting remains the most common use, delivering reliable results on deer, antelope, and similar animals at ranges up to 400 yards.
Its energy and bullet selection make it versatile for different game types. Hunters appreciate the balance of reach and terminal performance in environments where shot placement and ethical impact are essential. This flexibility supports both recreational and professional use.
Hog hunting also benefits from the cartridge's penetration and stopping power. Its ability to break through thick hide and bone while creating substantial wound channels has made it popular in wildlife management operations and feral hog control efforts.
Precision shooting highlights the cartridge’s accuracy when matched with quality barrels and optics. Moderate recoil, strong ballistic coefficients, and consistent velocities support competitive use within mid-range limitations, even if it cannot match extreme-range precision calibers.
The 338 ARC also performs well for property and predator management. It offers enough power for coyotes and similar threats while maintaining controllable recoil. This balance makes it more practical than full-power rifle cartridges for frequent field use.
Build a 338 ARC Setup That Delivers
Constructing an effective 338 ARC rifle starts with thoughtful component selection and system tuning. A quality upper assembly creates a dependable foundation, whether using basic builds or premium configurations with match-grade parts and enhanced tolerances for long-term reliability.
AR15 Parts features upper assemblies tailored to different budgets and performance goals. Our offerings streamline the building process and help ensure proper fit between key components without requiring extensive custom work or modification.
Lower receiver compatibility is excellent, as the 338 ARC pairs with standard AR-15 lowers and magazines made for 6.5 Grendel. ASC and Elander magazines typically hold 17-25 rounds. Triggers in the 3.5-4.5 pound range offer consistency and control.
Optics should match intended shooting distances and account for the cartridge’s ballistics. Variable-power scopes in the 2-10x or 3-15x range suit hunting and precision roles. Quality rings and bases help maintain zero under increased recoil compared to 5.56 NATO.
Some applications benefit from shorter barrels. The 8.5" 338 ARC Barrel - Shaw - Heavy - Matte SS - 1x8 - 5/8x24 offers maneuverability for tactical or close-range hunting. Although it loses some velocity, it remains effective within appropriate distances while improving handling.
Frequently Asked Questions
What makes the 338 ARC different from other AR-15 cartridges?
The 338 ARC uses a larger .338-caliber bullet compared to most AR-15 cartridges, providing significantly more kinetic energy and better terminal performance on medium to large game. This added impact offers hunters improved results in a familiar platform.
Unlike cartridges such as 5.56 NATO or 6.5 Grendel, the 338 ARC maintains hunting-effective energy levels beyond 400 yards. It still fits in standard AR-15 platforms with only a barrel and bolt change required, making upgrades straightforward.
Can I use standard AR-15 magazines with 338 ARC ammunition?
No, the 338 ARC requires magazines specifically designed for the 6.5 Grendel family of cartridges due to the different case dimensions. Standard 5.56 magazines will not properly feed 338 ARC ammunition and can cause reliability issues.
You'll need to use ASC or Elander magazines designed for 6.5 Grendel. These typically hold 17-25 rounds, depending on the specific magazine model, and provide consistent feeding with the larger cartridge.
What barrel length works best for hunting applications?
For most hunting applications, 16-18 inch barrels provide the optimal balance of velocity, accuracy, and maneuverability. They deliver nearly full ballistic potential while keeping overall rifle length practical for field carry.
Shorter barrels, around 12-14 inches, work well for close-range hunting in dense cover, while longer barrels up to 20 inches maximize velocity for long-range applications when weight and length are less of a concern.
How does the 338 ARC recoil compare to other cartridges?
The 338 ARC produces moderate recoil similar to a .308 Winchester in a comparable weight rifle, which is noticeably more than 5.56 NATO or 6.5 Grendel. Most shooters find it manageable for both hunting and target use.
The recoil is significantly less than that of magnum cartridges while still providing substantial downrange energy. Proper muzzle devices and adjustable stocks can further reduce felt recoil if needed and improve shooter comfort.
Is factory ammunition readily available for the 338 ARC?
Factory ammunition availability has improved significantly since the cartridge's introduction, with Hornady producing both BLACK and Precision Hunter lines. These options support different applications and make the cartridge easier to adopt.
While not as widely available as common cartridges like 5.56 NATO, most major sporting goods stores and online retailers stock 338 ARC ammunition. Handloading components are also available for those who prefer to load their own ammunition.
Plan Your Next Step with the 338 ARC Today!
The 338 ARC marks a notable advancement in AR-15 cartridge capabilities, offering serious performance in a familiar platform. Its design balances power, reach, and ease of integration for those who want more from their current setup.
With manageable recoil and strong energy retention, it supports ethical hunting and precise shooting at extended distances. Compatibility with existing AR-15 components makes it accessible without requiring a complete overhaul.
From property management to medium and large game pursuits, the 338 ARC gives shooters a versatile option that outperforms many traditional choices. Its growing adoption reflects demand for modern cartridges that deliver real results in the field.
About AR15 Parts
AR15 Parts has over a decade of experience supplying premium AR-15 components and complete uppers for hunters, competitive shooters, and tactical professionals. Our certified armorers combine technical knowledge and field experience to support demanding performance requirements.
We provide solutions for AR-15 builds that include complete uppers, precision barrels, and parts for cartridges such as the 338 ARC, 6.5 Grendel, and 300 Blackout. Our inventory spans basic components to match-grade assemblies for varied goals.
AR15 Parts partners with established manufacturers to ensure accuracy and reliability in critical applications. Thousands of customers have achieved performance benchmarks through informed component selection and hands-on guidance from our team.
Browse AR uppers & assemblies to explore options for your 338 ARC setup. Learn about complete upper assemblies and precision barrel choices, and see how customers achieve reliable accuracy and performance with properly configured systems.