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Questions & Answers
Is this .223 or .300 blackout? AI Answer

This ammunition is .300 AAC Blackout caliber, not .223.

by OpticsPlanet AI, October 31, 2026
Is this subsonic?

From the Specification information: Muzzle Velocity: 940 ft/s
That is subsonic.

by Frank, Verified Owner, April 19, 2022
Customer Reviews
Helpful Negative Review
Too bad one cartridge actually showed up without a primer or powder. Sorta calls into question every other round, but so long as they shoot, I suppose it's not a major deal. But it is something to know about.
2/3 found this helpful
Most Recent Reviews
Irresistible temptation to just keep on squeezing the trigger with this stuff.
Most Recent Reviews
Bulk ammo sub sonic by Outdoorspeople, Verified Owner, May 10, 2024
As expected and very fast shipping . It’s hard to find sub sonic ammo
Read All 3 Reviews

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Product Info for Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition

Offering solid all-range performance, UMC Ultra Max ammunition boasts a unique feature over other competitor ammunition: it has no gas plug. This feature eliminates one of the most common problems in .300 AAC Blackout ammo - over-penetration. With no-shorts-no doubles the fun starts right here. UMC Ultra Max ammunition's unique feature is its ability to fire two projectiles without reloading. Both rounds leave the barrel with the same speed, recoil and pressure characteristics you'd find in a match round. But UMC Ultra Max doesn't stop there. Its unique 220 grain open tip flat base ensures high weight retention and deep penetration downrange. Its flat base ensures uniform penetration and energy transfer giving you a big bang for your buck.image

WARNING: California`s Proposition 65

Specifications for Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition:

Manufacturer: Remington
Caliber: .300 AAC Blackout
Bullet Type: Open Tip Flat Base (OTFB)
Bullet Weight: 220 grain
Cartridge Case Material: Brass
Application: Target Shooting
Primer Style: Centerfire
Lead Free: No

Features of Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Cased Centerfire Rifle Ammo

  • First quality factory fresh components for reliable feed, function, and performance

Package Contents:

  • Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition

Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammunition Orderable Models

List of Orderable Models

  • Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammo, 160 Rounds, 20111 , MPN: 20111 , UPC: 047700487403 , Code: RT-LAR-20109-20111
  • Remington .300 AAC Blackout UMC 220 Grain Open Tip Flat Base Brass Rifle Ammo, 200 Rounds, 20109 , MPN: 20109 , UPC: 047700487601 , Code: RT-LAR-20109-20109
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Last updated 2026-11-04 UTC.