Remington UMC .300 AAC Blackout 220gr Open Tip Flat Base Ammo

The Remington UMC .300 AAC Blackout 220gr Open Tip Flat Base load (Remington part no. 21422) is built for shooters who put a lot of rounds through a suppressed or subsonic-tuned .300 Blackout carbine. UMC is Remington’s high-volume line of rifle ammunition, loaded in the USA with an emphasis on dependable function over premium price. The 220-grain open tip flat base bullet is a heavy-for-caliber pill that stabilizes well at subsonic velocities, which is exactly where a lot of .300 Blackout shooters run this cartridge. It is a straightforward, no-surprises choice for varmint hunting, target shooting, training days, or any high-volume range session.

Key Specifications

• Chambered in .300 AAC Blackout, a versatile carbine cartridge that performs at both supersonic and subsonic velocities.
• Loaded with a 220-grain bullet, a heavy-for-caliber weight that favors stable subsonic performance.
• Uses an Open Tip Flat Base bullet design, which feeds reliably and holds its flight path through suppressed barrels.
• Built on brass cases for smooth extraction and reliable reloading down the line.
• Packaged 20 rounds per box, sold 10 boxes to a case for shooters who train often.
• Runs about $1.55 per round, an affordable price point for high-volume range days.
• Ships at roughly 1 pound per box, an easy weight to plan around when ordering in bulk.
• Part of Remington’s UMC line, built specifically for high-volume training and practice rather than premium hunting duty.
• The flat base geometry keeps the bullet stable at the lower velocities many shooters run this caliber at, which is where a lot of .300 Blackout ammunition actually gets used.

Frequently Asked Questions

Is this a good choice for a suppressed .300 Blackout build? The 220-grain weight is a common pick for subsonic shooters, since heavier bullets stabilize better at reduced velocities.

What is UMC ammunition designed for? UMC is Remington’s high-volume line, built for training, target shooting, and other high-round-count range use.

Are the cases reloadable? Yes, this load uses brass cases, which handloaders can recover and reload.

Buy the Remington UMC .300 AAC Blackout 220gr Open Tip Flat Base Ammo

A .300 Blackout carbine earns its keep on high-volume range days, and UMC is built to keep pace without breaking the budget. Stock up and put more rounds downrange between range trips. Order from our Lubbock, Texas gun shop and it ships fast to your door.