Description
The Underwood 300 BLK 220gr Subsonic HP load, Underwood item 419, is a 20 round box of 300 AAC Blackout ammunition loaded with a 220 grain Subsonic bullet rated at 1030 fps with 518 ft-lbs of muzzle energy.
Underwood 300 BLK 220gr Subsonic HP Overview
Underwood Ammo builds high-performance ammunition in Sparta, Illinois, and is known for loading cartridges to their full potential. Many Underwood loads run faster than typical factory ammunition while staying within safe pressure limits, and the company pairs that speed with premium bullets from makers such as Lehigh Defense and Hornady. Cases are nickel plated for smooth feeding and corrosion resistance.
Bullet Design
This load uses a heavy 220 grain hollow point loaded below the speed of sound. Subsonic loads are designed for suppressed rifles, where they eliminate the supersonic crack and keep the report very quiet. Heavy bullets carry good momentum even at subsonic speed.
Intended Use
This load is built for suppressed shooting, hunting at close range and quiet target practice. Always confirm reliable feeding and point of impact in your own firearm before you rely on it.
Firearm Compatibility
This ammunition is made for firearms chambered in 300 AAC Blackout. Always check the caliber marking on your barrel or slide before loading. Underwood loads run at the upper end of safe pressure for the cartridge, so make sure your firearm is in good condition.
About Underwood Ammo
Underwood Ammo is a family-run American company that has built a reputation for powerful, accurate ammunition. Each load is developed and tested in-house, and the company publishes velocity and energy figures for every product so shooters know exactly what they are getting.
Recoil and Shootability
Recoil is in line with the cartridge and bullet weight. A good recoil pad and a solid position help with accuracy.
Why Shooters Choose Underwood
Shooters choose Underwood because the published numbers are real and the loads deliver them. Pairing premium bullets with carefully developed powder charges gives each load a clear purpose, whether that is defense, hunting or practice. Nickel or brass cases, quality primers and careful loading round out a product that many shooters trust when performance matters most.
Practice and Testing
Fire a few magazines or cylinders of this load before relying on it for defense or hunting. Confirm reliable feeding, extraction and point of impact, since fast or heavy loads can print to a different point than practice ammunition.
Choosing a Load
Choose your bullet for the job: solid copper fluid-transfer bullets for defense through barriers, expanding hollow points for controlled expansion, and hard cast or penetrator designs for large animals. Then pick a weight and speed you can shoot accurately.
Storage and Care
Store ammunition in a cool, dry place in its original boxes, away from solvents and lubricants that can contaminate primers. Inspect rounds before loading, and set aside any with dents, loose bullets or corrosion.
Specifications
- Brand: Underwood Ammo
- Item number: 419
- Caliber: 300 AAC Blackout
- Bullet weight: 220 grain
- Bullet type: Subsonic (hollowpoint)
- Muzzle velocity: 1030 fps
- Muzzle energy: 518 ft-lbs
- Case: Nickel
- Count: 20 rounds per box
- UPC: 816874021177
- Made in the USA
Before You Buy
Federal law requires buyers of rifle ammunition to be at least 18 years old when buying from a licensed dealer. Some states and cities restrict ammunition purchases, require background checks or limit shipping, so check your local rules before you order.
Who It Is For
The Underwood 300 BLK 220gr Subsonic HP is a great fit for shooters who want high-performance 300 AAC Blackout ammunition from an American maker known for powerful, accurate loads.
Buy the Underwood 300 BLK 220gr Subsonic HP at MAG5 Firearms
MAG5 Firearms is a family-owned FFL in Collegeville, Pennsylvania. Order the Underwood 300 BLK 220gr Subsonic HP online and we will ship it to you where state and local law allow, or browse our full selection of ammunition for more rifle loads. For factory details, visit Underwood Ammo.
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