223 Rem – 55 Grain FMJ – Remington UMC (L223R3A / 23683) – 800 Rounds

AR-15 owners who shoot every weekend need a dependable 55 grain load they can buy in larger boxes. This listing is Remington UMC 223 Remington 55 grain full metal jacket ammo, MPN L223R3A, in 200 round value boxes, sold as 800 rounds. It is sized for training courses, steel matches, and keeping rifles fed through a busy season. It is also a practical load for confirming zero after mounting a new optic.

Retail specifications rate this load at 3,240 fps with 1,282 ft-lbs of muzzle energy. A 55 grain FMJ is the most common 223 practice bullet, and it stabilizes well in virtually any AR twist rate from 1 in 12 to 1 in 7. It shoots flat enough to make 100 to 300 yard targets easy to hit. Because a full metal jacket bullet does not expand, this is range ammunition, not a hunting or home defense load.

It fits rifles chambered in 223 Remington and rifles marked 5.56x45mm NATO, including AR-15s from Colt, Smith and Wesson, Ruger, Daniel Defense, and Palmetto State Armory, the Ruger Mini-14, IWI Tavor, and bolt actions like the Ruger American Ranch and Savage Axis. A common question is whether this ammo is the same as 5.56 NATO. No. It is loaded to 223 pressure, which is safe in both 223 and 5.56 chambers. Another common question is whether 55 grain or 62 grain is better for practice. Both work. The 55 grain is usually cheaper and shoots well in slower twist barrels.

Remington L223R3A is new production ammunition, not reloads, made in the USA. It is loaded in reloadable brass cases with boxer primers and is non-corrosive. This listing ships as 4 boxes of 200 rounds, 800 total, from one lot, which means fewer boxes to open at the range and consistent function from your first magazine to your last. Store the boxes dry and away from heat to keep the lot consistent over time.