The best overall .300 Blackout subsonic hunting ammunition is the Hornady 190-grain Sub-X. Fired at a suppressed and hearing-safe 1,050 fps, it delivers 465 ft-lbs of muzzle energy to the target. Most heavy subsonic bullets fail to expand at low velocities, but the Sub-X utilizes a patented Flex Tip insert explicitly engineered to mushroom at speeds as low as 900 fps. This ensures massive terminal tissue damage and deep penetration rather than simply passing through the animal like a target round. Because it perfectly balances reliable rapid expansion with a high 0.437 ballistic coefficient, it maximizes the ethical hunting range of this specialized, low-velocity platform.
Best 300 Blackout Subsonic Hunting Ammo
| Ammo | Bullet Weight | Bullet Type | Muzzle Velocity | Muzzle Energy | BC | Price | Best Feature |
| Hornady Sub-X | 190 gr | Flex Tip Expanding | 1050 fps | 465 ft-lbs | 0.437 | $36.99 | Best Overall & Trajectory |
| Underwood Maximum Expansion | 194 gr | Machined Copper | 1050 fps | 475 ft-lbs | 0.410 | $49.99 | Best Terminal Expansion |
| Gorilla Silverback | 205 gr | Solid Copper Expanding | 1040 fps | 492 ft-lbs | 0.400 | $54.99 | Best Deep Penetration |
| Discreet Ballistics Selous | 188 gr | Machined Copper | 1050 fps | 460 ft-lbs | 0.310 | $48.00 | Best For Short Barrels |
| Winchester Super-X Subsonic | 200 gr | Jacketed Soft Point | 1060 fps | 499 ft-lbs | 0.300 | $29.99 | Best Budget Option |
Based on ballistic testing, the Hornady Sub-X 190 gr stands out as the best overall choice due to its highly efficient 0.437 ballistic coefficient, making it the best for longer-range subsonic hunting out to 100 yards. If you prioritize the absolute best terminal-performance option and the best expansion, the Underwood Maximum Expansion 194 gr utilizes a specialized Lehigh Defense bullet that peels back into four massive petals, doubling its diameter even at a slow 1,050 fps.
For the best penetration on tougher game like feral hogs, the heavy Gorilla Silverback 205 gr solid copper bullet retains 100% of its weight, driving deeply through gristle and bone with 492 ft-lbs of energy. The Discreet Ballistics Selous 188 gr is the best for short barrels, as their loads are specifically optimized to achieve perfect powder burn and consistent 1,050 fps velocities from 7-inch to 10.5-inch barrels. Finally, for hunters needing the best value for high-volume pest control, the Winchester Super-X Subsonic 200 gr provides a traditional jacketed soft point design that hits with 499 ft-lbs for under $30 a box.
Hornady Sub-X 190 gr
Pros
- Patented Flex Tip ensures reliable expansion at impact velocities as low as 900 fps.
- High 0.437 BC helps the heavy bullet retain 420 ft-lbs of energy at 100 yards.
- Widely available and reasonably priced for premium hunting ammunition.
Cons
- Lead core design does not retain 100% of its weight on heavy bone impacts.
- Can occasionally experience feeding issues in certain AR-15 magazines lacking a modified front rib.
Underwood Maximum Expansion 194 gr
Pros
- Utilizes the Lehigh Defense machined copper bullet for unmatched, massive four-petal expansion.
- Sharp, machined petals cut through tissue rather than just pushing it aside, maximizing blood trails.
- Lead-free construction is compliant with all local hunting regulations.
Cons
- Extremely expensive, costing roughly $2.50 per round.
- The massive expansion limits deep straight-line penetration on harsh quartering shots.
Gorilla Silverback 205 gr
Pros
- Heavier 205-grain solid copper design maximizes momentum for deep, straight-line penetration.
- Expands consistently at subsonic speeds without the risk of the petals snapping off.
- Manufactured with incredibly tight tolerances for precision accuracy.
Cons
- Among the most expensive subsonic hunting options on the market.
- Slower 1,040 fps muzzle velocity means bullet drop happens rapidly past 75 yards.
Discreet Ballistics Selous 188 gr
Pros
- Machined copper expander specifically engineered for SBRs and AR-pistols.
- Exceptional quality control ensures standard deviations in velocity are kept to single digits, preventing vertical stringing.
- Expands perfectly at lower velocities.
Cons
- Lower 0.310 BC means it sheds kinetic energy faster than the Hornady Sub-X.
- Often sold out due to boutique manufacturing scale.
Winchester Super-X Subsonic 200 gr
Pros
- Provides reliable soft point mushrooming at a highly affordable price point.
- Excellent choice for close-range hog or predator eradication over bait.
- Generates a class-leading 499 ft-lbs of muzzle energy.
Cons
- Soft point design requires slightly higher velocities to expand compared to machined copper or polymer tips.
- Lower BC (0.300) causes a severe rainbow trajectory beyond 75 yards.
300 Blackout Subsonic Hunting Ballistics
When comparing the ballistics of these subsonic deer and hog hunting loads, it is crucial to understand that velocity remains relatively stable, but bullet drop is immense. The following data is based on a standard 9-inch test barrel with a 50-yard zero.
- Hornady Sub-X 190 gr
- Muzzle: 1,050 fps / 465 ft-lbs
- 50 Yards: 1,022 fps / 441 ft-lbs
- 100 Yards: 998 fps / 420 ft-lbs (Drop: -7.5 inches)
- 150 Yards: 975 fps / 401 ft-lbs (Drop: -24.0 inches)
- BC: 0.437
- Underwood Maximum Expansion 194 gr
- Muzzle: 1,050 fps / 475 ft-lbs
- 50 Yards: 1,015 fps / 444 ft-lbs
- 100 Yards: 985 fps / 418 ft-lbs (Drop: -7.8 inches)
- 150 Yards: 958 fps / 395 ft-lbs (Drop: -25.2 inches)
- BC: 0.410
- Discreet Ballistics Selous 188 gr
- Muzzle: 1,050 fps / 460 ft-lbs
- 50 Yards: 1,005 fps / 421 ft-lbs
- 100 Yards: 965 fps / 388 ft-lbs (Drop: -8.2 inches)
- BC: 0.310
At 150 yards, these bullets are dropping two feet. This data illustrates why subsonic .300 Blackout must be treated like an archery setup or a straight-walled pistol cartridge rather than a traditional rifle round.
Supersonic vs Subsonic
If you are hunting with .300 Blackout, understanding the difference between supersonic and subsonic terminal performance is the difference between a clean harvest and a lost animal.
Standard supersonic .300 Blackout loads (110–150 grains) strike the target at roughly 2,000 fps with over 1,200 ft-lbs of energy. They rely on high-velocity hydrostatic shock to destroy vital organs.
Subsonic loads (188–220 grains) strike the target at roughly 1,000 fps with under 500 ft-lbs of energy. Because they lack high-velocity kinetic energy, they must rely on massive mechanical expansion to cause lethal hemorrhage. Do not recommend subsonic target ammunition (such as 220-grain Open Tip Match or FMJ) for hunting. Heavy target bullets will not expand at 1,000 fps; they will punch a pencil-sized hole straight through the animal, resulting in a slow death and a lost blood trail. You must use specialized expanding subsonic bullets engineered to open at low speeds.
300 Blackout Subsonic Bullet Weight
Heavy bullet weights are required to maintain subsonic speeds while still offering enough mass to generate penetration.
- 188 to 195 Grain: The modern sweet spot for expanding subsonics. By dropping slightly below 200 grains, manufacturers like Discreet Ballistics and Hornady can maximize the length and design of the expanding cavity without over-compressing the powder charge.
- 200 to 205 Grain: Excellent heavyweight penetrators. Bullets like the Gorilla Silverback offer massive momentum for crashing through the shoulder shield of a feral hog.
- 220 Grain: Traditionally the standard subsonic weight. However, most 220-grain bullets are target OTMs (Open Tip Match) that do not expand. If you hunt with a 220-grain bullet, ensure it is specifically cast or machined to expand at 1,000 fps.
Bullet Construction
- Machined Monolithic Copper: Bullets like the Underwood Maximum Expansion and Discreet Ballistics Selous are CNC-machined from solid copper. This allows engineers to create deep cavities with pre-stressed fault lines that force the bullet to peel back into sharp, massive petals at exact subsonic velocities.
- Polymer-Tip Expanding: The Hornady Sub-X uses a soft lead core with a serrated copper jacket. A patented Flex Tip is driven backward into the lead core upon impact, physically wedging the bullet open at speeds where hydraulic pressure alone would fail.
- Jacketed Soft Point: Traditional exposed lead noses (like the Winchester Super-X). They rely on the sheer mass of the heavy lead driving forward to pancake the nose upon impact.
Penetration And Expansion
Using reputable ballistic gel testing, the difference between standard and premium subsonic loads is dramatic.
When fired into 10% ordinance gel at 50 yards, the Underwood 194 gr Maximum Expansion routinely penetrates 16 to 18 inches while opening to an astonishing 1.15 inches in diameter. This creates a permanent wound cavity similar to a broadhead arrow. Conversely, the Gorilla 205 gr Silverback generally penetrates deeper (20 to 22 inches) while expanding to roughly 0.75 inches, making it a better choice if you expect to shoot through heavy bone.
300 Blackout Subsonic Hunting Range
The practical hunting range of subsonic .300 Blackout is severely limited by its rainbow trajectory and low kinetic energy.
- 50 Yards: The absolute sweet spot. The bullet is at maximum energy, trajectory is perfectly flat, and expansion is guaranteed. Perfect for hunting hogs over bait or deer in thick cedar swamps.
- 75 Yards: Highly effective, but the bullet will begin to drop 1 to 2 inches depending on your zero.
- 100 Yards: The maximum ethical range for most hunters. Energy drops toward 400 ft-lbs, which is the bare minimum for whitetail deer. Bullet drop is roughly 7 to 8 inches, requiring precise holdovers.
- 150+ Yards: Unethical for live game. At 150 yards, bullet drop exceeds 24 inches, and the time-of-flight is so slow that the animal can literally take a step before the bullet arrives (string jumping).
Barrel Length
The .300 Blackout cartridge utilizes fast-burning pistol powders, meaning it reaches peak pressure and velocity very quickly.
- 7 to 9 Inches: The optimal barrel length for subsonic hunting. It keeps the overall length of the firearm extremely short and maneuverable when a 6-to-8-inch suppressor is attached.
- 10.5 Inches: A great middle-ground that guarantees stabilization of heavy 200+ grain bullets while keeping the rifle compact.
- 16 Inches: Counterproductive for a dedicated subsonic setup. Pushing a subsonic bullet down a 16-inch barrel creates excessive friction, which can actually slow the bullet down or cause inconsistent velocities. Furthermore, adding a suppressor to a 16-inch barrel makes the rifle cumbersome in thick brush.
Short Barrel Performance
Because subsonic ammunition is loaded with small charges of fast-burning powder, it performs flawlessly from short-barreled rifles (SBRs) and AR-pistols. A load like the Discreet Ballistics Selous will exit an 8-inch barrel at exactly 1,050 fps and fully stabilize. The tradeoff is purely aerodynamic; there is no velocity penalty for using a short barrel with subsonic ammunition, making it the ultimate compact truck gun or blind rifle.
Price And Value
Specialized subsonic expanding projectiles require extensive machining and testing, making them significantly more expensive than standard supersonic ammo.
| Ammo | Box Size | Current Price | Price Per Round | Value |
| Winchester Super-X Subsonic 200 gr | 20 | $29.99 | $1.50 | Excellent |
| Hornady Sub-X 190 gr | 20 | $36.99 | $1.85 | Very Good |
| Discreet Ballistics Selous 188 gr | 20 | $48.00 | $2.40 | Good |
| Underwood Maximum Expansion 194 gr | 20 | $49.99 | $2.50 | Fair |
| Gorilla Silverback 205 gr | 20 | $54.99 | $2.75 | Fair |
Note: Prices checked late 2026. Subsonic ammunition is frequently subject to boutique pricing and limited availability.
Final Ranking
| Rank | 300 Blackout Ammo | Best For | Why |
| 1 | Hornady Sub-X 190 gr | Overall Hunting / Deer | Best combination of reliable low-velocity expansion, high BC, and general availability. |
| 2 | Underwood Maximum Expansion 194 gr | Maximum Tissue Damage | Machined petals open to over an inch in diameter, producing massive blood trails. |
| 3 | Gorilla Silverback 205 gr | Deep Penetration / Hogs | Heavy 205-grain solid copper design drives deep through thick gristle and bone. |
| 4 | Discreet Ballistics Selous 188 gr | SBRs and Suppressors | Meticulously loaded to provide perfect consistency from short 7- to 9-inch barrels. |
| 5 | Winchester Super-X Subsonic 200 gr | Budget Eradication | Provides classic soft-point terminal performance at a highly accessible price point. |
Best 300 Blackout Subsonic Hunting Ammo: Which Should You Choose?
The Hornady Sub-X 190 gr is the best overall subsonic hunting ammo. Its flex-tip design ensures expansion at incredibly low speeds, while its 0.437 BC helps it retain enough energy to ethically take deer at 100 yards.
For hunters focused on the best premium option with maximum terminal damage, the Underwood Maximum Expansion 194 gr creates wound cavities that rival broadhead arrows. If you are eradicating raccoons, coyotes, or hogs at close range and need the best value, the Winchester Super-X Subsonic 200 gr performs beautifully for $1.50 a round. For hunters running ultra-short 7-inch barrels, the Discreet Ballistics Selous 188 gr is the best for short barrels because of its tight quality control and specific SBR powder tuning. Finally, for tough, heavy-boned feral hogs where the data requires deep penetration, the Gorilla Silverback 205 gr solid copper bullet guarantees zero core separation and devastating straight-line penetration.
FAQs
What is the best 300 blackout subsonic hunting ammo?
The Hornady 190-grain Sub-X is widely considered the best overall .300 Blackout subsonic hunting ammo due to its reliable low-velocity expansion and excellent ballistic coefficient.
Can you hunt deer with subsonic 300 Blackout?
Yes, but you must use specialized expanding ammunition (like the Hornady Sub-X or Lehigh Maximum Expansion) and keep your shots under 100 yards.
Is 220 grain 300 Blackout good for hunting?
Generally, no. Most 220-grain .300 Blackout ammunition is Open Tip Match (OTM) or Full Metal Jacket (FMJ) designed for paper targets. They will not expand at subsonic speeds and will result in lost animals.
What grain 300 Blackout is best for subsonic hunting?
Expanding bullets in the 188-grain to 205-grain range are best because they allow enough space in the cartridge for proper bullet design without compressing the powder.
How far is subsonic 300 Blackout effective for hunting?
The ethical maximum range is 100 yards. Beyond 100 yards, the bullet drops dramatically and kinetic energy falls below the threshold needed for an ethical kill.
Is subsonic 300 Blackout good for hunting hogs?
Yes, it is excellent for close-range hog eradication (under 75 yards) over bait, especially when suppressed to avoid scattering the entire sounder immediately.
Which subsonic 300 Blackout ammo has the best expansion?
The Underwood Maximum Expansion 194 gr utilizes a machined copper bullet that peels back into four massive, razor-sharp petals, offering the widest expansion on the market.
Which subsonic 300 Blackout ammo has the best penetration?
The Gorilla Silverback 205 gr offers the best penetration. Because it is a heavy solid copper projectile, it retains 100% of its weight when smashing through bone.
What is the best barrel length for subsonic 300 Blackout?
Barrels between 7 and 10.5 inches are optimal. They provide full powder burn for subsonic loads while keeping the overall length manageable when a suppressor is attached.
Does a suppressor increase subsonic velocity?
A suppressor will often increase velocity by roughly 10 to 20 fps (known as “freebore boost”), but it will not push a properly loaded 1,050 fps subsonic round past the sound barrier.
Why is my subsonic hunting ammo not expanding?
If you are using standard target ammunition, it is not designed to expand at 1,000 fps. You must purchase premium ammunition explicitly labeled as expanding for subsonic velocities.