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Questions & Answers
Is this subsonic? Assuming not.

Yes it is subsonic. the sound barrier is roughly 1,100fps at sea level

by Wyatt Sherment, Verified Owner, June 10, 2026
Is this ammo safe to shoot in 1:3 twist 8.6 Blackout barrel without jacket separation being a lead core projectile?

I cannot answer with 100% certainty, but everything I have read in my search for reloading data indicates that at subsonic velocities, jacketed bullets are fine. In supersonic loads, opinions vary, mainly based on bullet construction.

by Steve, Verified Owner, February 14, 2026
Customer Reviews
Most Recent Reviews
great amko! by Marc Beaupre, Verified Owner, June 23, 2026
Underwood never disappoints!! This 8.6 Blackout is super quiet and very accurate!! Will be buying more!
Read 1 Review
Number of Rounds:
20

Code: 40U-LAR-A951U-951

MPN: 951

UPC: 816874024093

List: $89.00Save 29%
$3.17/Round
$63.49

Product Info for Underwood Ammo 8.6mm Blackout 300 grain Brass Cased Jacketed Hollow Point Rifle Ammunition

Nosler has blended the accuracy of its Custom Competition bullet jackets with its own ultra-precise, lead-alloy cores to create the performance standard for match rifle and pistol bullets. The hollow point provides a small meplat for reduced drag and increased aerodynamic efficiency while the pronounced boat-tail design provides efficient flight characteristics over a wide range of velocities.image

We have set the bar even higher with our match grade ammo offerings, it is hand crafted with even more stringent standards than our other fine offerings. Only with the utmost time, care, and detail in mind, our match grade ammo is perfect for competition shooters, long range and large game hunters, and the most disciplined sharpshooters alike. We feel that this is the finest example of ammunition available on the market today, where performance, precision, consistency, and value find marriage in one perfect cartridge.

Powder charges are hand thrown to deliver consistency and accuracy with each shot.

Our match grade ammo is personally hand crafted by Underwood Ballsiticians in small batches and is truly rival to some of the world's best handloads.

Nickel-plated brass casings, our nickel plating process provides several key benefits, not limited to but including; improved feeding in all actions of firearms enhanced corrosion resistance over traditional brass, improved cosmetics, and ease of cleanup during reloading. Nickel-plated casings will not tarnish like brass during storage or when in contact with foreign materials such as leather, moisture, and other metals.

As with all of Underwood Ammo rounds, we utilize flash suppressed powder so that your vision will not be compromised if it becomes necessary to use your firearm in low light.

While taking advantage of our state of the art testing equipment, this high-performance ammunition is field tested using popular, real firearms that our customers are most likely to own out in the real world with all the elements you would experience.

This ammunition is new production, non-corrosive, in boxer primed, reloadable brass cases.

Specifications for Underwood Ammo 8.6mm Blackout 300 grain Brass Cased Jacketed Hollow Point Rifle Ammunition:

Manufacturer: Underwood Ammo
Caliber: 8.6mm Blackout
Number of Rounds: 20
Bullet Type: Jacketed Hollow Point (JHP)
Bullet Weight: 300 grain
Cartridge Case Material: Brass
Muzzle Velocity: 950 ft/s
Muzzle Energy: 601.6 ft-lbs
Application: Target
Lead Free: No
Packed Size: 1.55x3.2x6.15 in
Barrel Length: 12 in
Gun Type: Rifle

Package Contents:

  • Underwood Ammo 8.6mm Blackout 300 grain Brass Cased Jacketed Hollow Point Rifle Ammunition

Underwood Ammo 8.6mm Blackout 300 grain Brass Cased Jacketed Hollow Point Rifle Ammunition Orderable Models

List of Orderable Models

  • Underwood Ammo 8.6mm Blackout 300 grain Brass Cased Jacketed Hollow Point Rifle Ammo, 20 Round, 951 , MPN: 951 , UPC: 816874024093 , Code: 40U-LAR-A951U-951
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Last updated 2026-08-06 UTC.