Remington UMC .300 Blackout 220gr OTFB Ammo – 50 Round Box

Description

The .300 Blackout cartridge was built to do two things well: run supersonic loads through a standard AR-15 and switch over to subsonic rounds for suppressed work without missing a beat. Remington's UMC 220 grain load falls into that second camp, giving you a heavy, slow moving bullet that stays well under the sound barrier. This 50 round box is loaded with fresh brass cases and Kleanbore primers, made right at Remington's Lonoke, Arkansas plant, so you're getting consistent ammo without the boutique price tag that usually comes with subsonic rounds.

What the 220gr OTFB Bullet Brings to the Table

The open tip flat base bullet in this UMC load isn't a hunting hollow point, so don't expect expansion on impact. Instead, the narrow meplat and molten-core construction give it a smooth, form-fitted lead core that helps with rotational stability, while the flat base offers a uniform surface for propellant gases to push against as the bullet leaves the case. With a G1 ballistic coefficient around 0.68, it holds its trajectory well for a subsonic round, which makes it a solid pick for target work, steel plates, and varmint control at closer ranges.

Running UMC 220 Grain Through Your 300 Blackout Rifle

Because this load sits around 1,015 fps, it's firmly in subsonic territory, which is exactly what most 300 Blackout shooters are after when they're running a can. A lot of AR-15s chambered in this caliber are gassed with suppressed subsonic shooting in mind, so this ammo tends to cycle best with a suppressor attached. If you're shooting unsuppressed, some rifles with tighter gas ports may need a lighter buffer spring to cycle heavier subsonic loads reliably, which is common across the board with 220 grain ammo in this caliber and not unique to this load.

Each case is brass, boxer primed, and fully reloadable, so if you load your own ammo, this is a good way to build up a stash of once-fired brass while still getting solid factory performance out of the box. The non-corrosive primers and clean burning powder also mean less fouling in your action, which matters if you're putting a lot of rounds through a suppressed setup in one range trip. Between the price point and the round count in this box, it's an easy load to keep in bulk for practice days.