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Underwood Ammo Subsonic Rifle Nickel Plated Brass 8.6 Blackout 300 Grain 20-Rounds HPBT

Underwood Ammo
The Underwood Subsonic Rifle Ammunition is a 300-grain HPBT subsonic load chambered in 8.6 Blackout, delivering 950 fps muzzle velocity and 601.6 ft. lbs. of muzzle energy from a 12-inch test barrel in suppressor-safe nickel-plated brass cases. Loaded with a Custom Competition hollow point boat tail projectile constructed from copper and lead, this Underwood 8.6 Blackout subsonic load is purpose-engineered for precision target shooting applications on suppressed rifle platforms where subsonic velocity and quiet operation are the priority. Packaged 20 rounds per box, this ammunition delivers the consistent, subsonic performance that 8.6 Blackout shooters demand from a premium suppressor-safe load.
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GAG_UB951
$54.99
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$52.24
$54.99
($2.61 per round)
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Underwood Subsonic Rifle Ammunition 8.6 Blackout Features

The Subsonic Rifle Ammunition is loaded with a 300-grain Custom Competition hollow point boat tail projectile, a bullet design that combines the accuracy-optimizing aerodynamics of the boat tail base geometry with the terminal performance characteristics of a hollow point cavity in a high-weight subsonic configuration purpose-built for the 8.6 Blackout cartridge. The copper and lead construction delivers the consistent dimensional uniformity and ballistic coefficient performance needed for precision target applications, and the heavy 300-grain weight is specifically optimized for the subsonic velocity envelope of the 8.6 Blackout platform. At 950 fps from a 12-inch test barrel, this load remains reliably subsonic across a wide range of barrel lengths, ensuring consistent suppressed performance without the sonic crack associated with supersonic ammunition.

The nickel-plated brass case provides a corrosion-resistant, smooth-cycling case surface that feeds reliably in semi-automatic and bolt action 8.6 Blackout hosts while offering excellent case life for reloaders who want to recycle premium brass after initial firing. Suppressor-safe certification ensures this load is engineered to function reliably without the excessive carbon, debris, or pressure issues that can affect suppressor performance and longevity with non-approved loads. The 601.6 ft. lbs. of muzzle energy delivered by the 300-grain projectile at subsonic velocity provides meaningful terminal performance for target applications while remaining within the subsonic performance envelope that defines the 8.6 Blackout platform's primary use case.

Underwood Subsonic Rifle Ammunition 8.6 Blackout Specifications

  • Manufacturer: Underwood
  • Model: Subsonic Rifle Ammunition
  • Cartridge: 8.6 Blackout
  • Bullet Weight: 300 gr.
  • Bullet Type: HPBT
  • Bullet Construction: Hollow Point Boat Tail
  • Bullet Material: Copper, Lead
  • Bullet Model: Custom Competition
  • Muzzle Velocity: 950 fps
  • Muzzle Energy: 601.6 ft. lbs.
  • Test Barrel Length: 12"
  • Case Type: Nickel Plated Brass
  • Velocity Rating: Subsonic
  • Suppressor Safe: Yes
  • Lead Free: No
  • Gun Type: Rifle
  • Rounds Per Box: 20
More Information
Threaded Barrel No
Caliber 8.6 Blackout
Capacity 20
Condition New in Box
Finish Per Color Nickel Plated Brass
Manufacturer Underwood Ammo
Manufacturer Part Number 951
Model Subsonic Rifle Ammunition
Type Rifle Ammo
UPC 816874024093

⚠ WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV

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