Best Grain for 300 Blackout

The right grain weight for 300 Blackout depends entirely on whether you're running supersonic or subsonic.

Lighter 110 to 125 grain bullets deliver flatter trajectories and more energy at range in supersonic loads, while heavier 190 to 220 grain bullets are what make subsonic, suppressor-friendly shooting possible at all.

300 Blackout has one of the widest grain ranges of any common AR-15 caliber, from a 110 grain supersonic bullet to a 220 grain-plus subsonic bullet, roughly double the weight.

Most modern barrels use a 1:7 or 1:8 twist rate specifically to stabilize that entire range, according to twist rate guidance from Atomic Ammunition and HOP Munitions.

Below are our top picks across the five main grain classes you'll encounter.

Best for: Maximum velocity and flat trajectory.

At the light end of the supersonic range, 110 grain loads deliver the highest velocity 300 Blackout offers, around 2,350 fps and 1,349 ft-lbs from a 16 inch barrel per RifleConfigurator's testing.

That speed comes at the cost of the least downrange retained energy among the supersonic weights.

Specs

• Grain: 110
• Velocity: ~2,350 fps (16" barrel)
• Bullet type: Triple Shock Flat Base
• Case: Brass

The Barnes VOR-TX 110gr TAC-TX is a premium .300 Blackout hunting load designed to deliver dependable expansion and penetration at the cartridge’s typical supersonic velocities.

Its 110-grain TAC-TX projectile uses an all-copper construction and polymer tip engineered to initiate expansion after impact. Because the bullet contains no traditional lead core, the TAC-TX is designed to retain much of its weight as it expands.

The relatively light 110-grain projectile also achieves higher velocities and a flatter trajectory than heavyweight subsonic .300 Blackout loads, making it a natural fit for hunting within the cartridge’s effective range.

Barnes has built much of its reputation around copper hunting bullets, and the VOR-TX line showcases that expertise in factory-loaded ammunition.

Overall, the 110gr TAC-TX is a strong choice for hunters seeking a purpose-built .300 Blackout load with controlled expansion, solid weight retention, and consistent terminal performance.

Sources

• Rifle Configurator, Best 300 Blackout Ammo 2026

Best for: Balanced defensive and general-purpose use.

The 125 grain weight is the traditional middle ground for 300 Blackout supersonic loads, running around 2,175 fps and 1,313 ft-lbs of energy according to comparison data compiled by The Big Game Hunting Blog.

It gives up a little velocity compared to the 110 grain class but carries more bullet weight downrange.

Specs

• Grain: 125
• Velocity: ~2,175 fps
• Bullet type: Hollow point, expanding
• Case: Brass

The Hornady 300 Blackout 125gr HP Supersonic is a versatile load built around a 125-grain hollow-point projectile and the higher velocities of supersonic .300 Blackout ammunition.

Its hollow-point bullet design distinguishes it from conventional FMJ range loads while offering a useful balance of bullet weight and velocity. At 125 grains, this ammunition sits between lightweight 110-grain loads and heavier 150-grain or subsonic options.

The supersonic velocity provides a flatter trajectory and less bullet drop than heavyweight subsonic ammunition, making it practical for target shooting and other applications where predictable downrange performance is important.

Hornady is widely recognized for producing application-specific bullets and carefully manufactured factory ammunition.

Overall, its 125gr HP Supersonic offers .300 Blackout shooters a well-balanced option combining moderate projectile weight, supersonic performance, and Hornady’s established approach to ammunition quality.

Sources

• Bear Creek Arsenal, 300 Blackout vs 7.62x39: Which is Better?

Best for: Deer and hog hunting at close range.

Pew Pew Tactical names this jacketed soft point its top supersonic hunting round for 300 Blackout.

The heavier 150 grain bullet sits between the fast 110 to 125 grain defensive loads and the heavy subsonic hunting options, giving controlled expansion without sacrificing too much velocity.

Specs

• Grain: 150
• Velocity: Supersonic (barrel-length dependent)
• Bullet type: Jacketed soft point, expanding
• Case: Brass

The Federal Power-Shok 150gr JSP is a straightforward .300 Blackout hunting load built around a traditional jacketed soft-point bullet.

Its 150-grain projectile features an exposed lead tip designed to promote controlled expansion on impact while maintaining enough weight for dependable penetration.

Compared with lighter, faster .300 Blackout loads, the 150gr Power-Shok offers a heavier projectile and a more conventional hunting-bullet design. This makes it a practical choice for hunters who prefer proven soft-point construction rather than specialized polymer-tipped or all-copper bullets.

Federal’s Power-Shok line is designed to provide reliable performance at an accessible price, making it suitable for both practice and hunting.

Overall, the 150gr JSP is a solid, no-frills .300 Blackout hunting option for deer and similarly sized game within the cartridge’s appropriate range.

Sources

• Pew Pew Tactical, Best 300 Blackout Ammo: Self-Defense, Hunting, Target

Best for: Suppressed home defense and hunting.

The Sub-X bullet uses a Flex Tip design engineered to expand reliably even at subsonic velocities, which is a real limitation for many hollow points once they drop below the sound barrier.

Ammo.com and ProArmory both name this Hornady load their top subsonic pick, citing consistent expansion and accuracy from a suppressed AR platform.

Specs

• Grain: 190
• Velocity: ~1,050 fps (subsonic)
• Bullet type: Sub-X Flex Tip, expanding
• Case: Brass 

The Hornady Subsonic 190gr Sub-X is a purpose-built .300 Blackout load designed to deliver controlled expansion at the lower velocities associated with subsonic ammunition.

Its 190-grain Sub-X projectile uses a polymer Flex Tip that helps initiate expansion within the bullet’s intended velocity range. Unlike conventional rifle bullets that may require higher impact velocities to expand reliably, the Sub-X is engineered specifically around subsonic performance.

The heavier projectile also produces the low-velocity characteristics that make .300 Blackout popular for specialized suppressed shooting applications.

Hornady pairs the Sub-X bullet with carefully selected components to promote consistent cycling and dependable accuracy in compatible firearms.

Overall, the 190gr Sub-X stands out as a specialized .300 Blackout option for shooters seeking an expanding projectile designed specifically for subsonic velocities.

Sources

• Ammo.com, Best 300 Blackout Subsonic Ammo
• ProArmory, Best .300 Blackout Ammo: Hunting, Self-Defense, & Target Practice

Best for: Budget plinking through a suppressor.

Pew Pew Tactical names this its top subsonic plinking round.

At 200 grains it sits slightly lighter than the 220 grain FMJ option above, giving a marginally faster subsonic velocity while remaining well under the sound barrier.

Specs

• Grain: 200
• Velocity: Subsonic (under ~1,100 fps)
• Bullet type: Full metal jacket
• Case: Brass

The Sellier & Bellot 200gr FMJ Subsonic is a practical .300 Blackout load designed for target shooting, training, and suppressed range use. Its heavy 200-grain full metal jacket projectile is intended to provide consistent function and accuracy while maintaining subsonic velocities under typical conditions.

Unlike expanding hunting ammunition, the FMJ bullet uses a conventional design focused on predictable range performance rather than terminal expansion.

When paired with a suppressor, its subsonic velocity also avoids the distinctive supersonic crack, helping take advantage of one of the .300 Blackout cartridge’s defining characteristics.

Sellier & Bellot has a long history of producing dependable ammunition for sporting and recreational shooters.

Overall, its 200gr FMJ Subsonic is a solid choice for shooters seeking straightforward, cost-conscious .300 Blackout ammunition for suppressed practice and general range use.

Sources

• Pew Pew Tactical, Best 300 Blackout Ammo: Self-Defense, Hunting, Target

The comparison chart highlights how .300 Blackout ammunition spans a wide range of bullet weights and projectile designs, with each offering characteristics suited to different applications.

Lighter options, such as the Barnes 110gr VOR-TX TAC-TX and Hornady 125gr American Gunner, emphasize lower projectile weight, while Federal’s 150gr Power-Shok provides a middle-ground option with a traditional jacketed soft-point design.

At the heavier end, Hornady’s 190gr Sub-X and Sellier & Bellot’s 200gr Tactical represent loads designed around heavier projectiles, including subsonic-oriented offerings.

The chart also demonstrates the variety of bullet constructions available, from hollow points and soft points to Flex Tip and FMJ designs.

Overall, bullet weight and projectile construction are two of the most important factors to compare when selecting .300 Blackout ammunition for a particular shooting application.

Hornady Ammunition

Founded in 1949, Hornady is a prominent American ammunition and bullet manufacturer known for innovative projectile designs and application-specific loads.

Its catalog covers hunting, defense, competition, and recreational shooting, with recognizable product families such as BLACK, V-MAX, Sub-X, and Critical Defense. Hornady has built its reputation around consistent manufacturing and ongoing bullet development.

Federal Ammunition

Federal Ammunition has been manufacturing cartridges in the United States since 1922 and today offers one of the industry’s broadest selections.

Its ammunition spans hunting, competition, personal defense, and target shooting, with well-known lines including American Eagle, Power-Shok, HST, and Gold Medal. Federal is particularly recognized for offering options ranging from affordable practice rounds to specialized premium loads.

Nosler Ammunition

Nosler traces its roots to 1948, when John Nosler began developing a hunting bullet that ultimately became the famous Partition.

Since then, the Oregon-based company has expanded into premium bullets, cartridge cases, and complete ammunition. Nosler remains closely associated with hunting and precision shooting, combining distinctive projectile designs with loads developed for accuracy and dependable field performance.

Sellier & Bellot Ammunition

Sellier & Bellot is one of the world’s oldest continuously operating ammunition manufacturers, with origins dating to 1825. Based in the Czech Republic, the company produces a wide assortment of rifle, handgun, shotgun, and rimfire ammunition.

Its extensive catalog and long manufacturing history have made Sellier & Bellot a familiar choice for shooters seeking practical ammunition for training, competition, hunting, and recreational use.

Question: What grain 300 Blackout is best for a first-time buyer?
Answer: A 125 grain supersonic hollow point is the most versatile starting point. It works for defense, range use, and light hunting without requiring a suppressor or gas system tuning.

Question: Do I need a different twist rate for heavier subsonic bullets?
Answer: Yes, generally. A 1:8 twist handles most loads up to about 220 grains, but a 1:7 twist gives more stability margin if you plan to run the heaviest 220 grain-plus subsonic loads consistently.

Question: Why does 300 Blackout have such a wide grain range?
Answer: The cartridge was designed to run both fast, flat-shooting supersonic loads and quiet subsonic loads through the same barrel and action, which requires bullet weights spanning from 110 to 220-plus grains.

Question: Is heavier always better for 300 Blackout?
Answer: No. Heavier bullets favor subsonic, suppressed use, while lighter bullets favor supersonic velocity and flatter trajectory. The right grain depends on your intended use, not raw bullet weight.

• Rifle Configurator, Best 300 Blackout Ammo 2026
• Ammo.com, Best 300 Blackout Subsonic Ammo
• ProArmory, Best .300 Blackout Ammo: Hunting, Self-Defense, & Target Practice
• Bear Creek Arsenal, 300 Blackout vs 7.62x39: Which is Better?
• Pew Pew Tactical, Best 300 Blackout Ammo: Self-Defense, Hunting, Target
• NSSF/SAAMI, Official Specifications

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