.300 AAC Blackout 220gr Subsonic Rifle Ammo | Remington UMC

Description

This 220-grain open tip flat base round is purpose-built for the .300 Blackout platform and hits well below the sound barrier at 940 fps. The heavy bullet and subsonic velocity make it the go-to choice for anyone running a suppressor, eliminating the supersonic crack that even a suppressor can't fully muffle. When fired suppressed, these rounds live up to the quiet reputation the caliber earned in its original military design.

Remington UMC Quality You Can Count On

UMC ammunition has been around for decades and sits at the sweet spot between reliability and value. These cartridges come in reloadable brass cases with non-corrosive primers, so if you reload, you've got cases worth saving. The ammunition is loaded right here in the USA and features clean-burning powders that'll keep your bolt carrier cleaner than dirtier surplus stuff. You're not paying premium match-grade prices, but you're getting solid factory ammunition that groups consistently at the ranges where subsonic .300 Blackout typically performs.

Designed for AR-15 Reliability

The open tip flat base bullet design works with standard AR-15 magazines and bolts, no modifications needed. The round's powder charge was specifically tuned to cycle reliably in AR-15s while keeping velocity subsonic, so you get the reliability people expect from the platform without having to fiddle with gas blocks or springs. A cannelure on the bullet ensures loaded length consistency and keeps the crimp holding firm, eliminating bullet setback issues that can plague reloaded subsonic ammo. This attention to detail shows Remington understands what people actually use this ammunition for.