300 AAC – 125 gr OT – Winchester (USA300BLK) – 200 Rounds

Not every 300 Blackout session needs subsonic loads. Supersonic ammo is ideal for unsuppressed rifles, short barrel AR builds, and range practice at longer distances. This listing is Winchester USA 300 AAC Blackout 125 grain open tip ammo, MPN USA300BLK, sold as a 200 round case of affordable, brass-cased training ammunition. It is a popular choice for owners breaking in a new 300 Blackout upper.

Winchester rates USA300BLK at 2,185 fps with 1,325 ft-lbs of muzzle energy. That is a supersonic load with a flatter trajectory than heavy subsonic rounds, and it reliably cycles most 300 Blackout rifles without a suppressor. The 125 grain open tip range bullet is built for practice and target work. Use it for drills, steel, and getting to know your rifle, and choose a dedicated hunting bullet for deer or hogs.

It fits firearms chambered in 300 AAC Blackout, including AR-15 uppers and complete rifles from Daniel Defense, Smith and Wesson, Ruger, and Palmetto State Armory, the SIG MCX and Rattler, CMMG Banshee, and the Ruger American Ranch. A common question is whether supersonic and subsonic 300 BLK shoot to the same point of impact. They do not, and the difference can be large, so zero for the load you plan to use most. Another common question is whether 300 BLK can be fired in a 223 rifle. Never. Chambering 300 BLK in a 223 or 5.56 rifle can cause a catastrophic failure.

Winchester USA300BLK is new production ammunition, not reloads, made in the USA. Cases are reloadable brass with boxer primers, and the load is non-corrosive. This listing ships as 10 boxes of 20 rounds, 200 total, from one lot, so you can confirm zero, practice drills, and shoot steel with one consistent load. Keep it stored apart from any 223 ammunition. Twenty round boxes also make it easy to track how many rounds each range session uses. Store the boxes cool and dry between trips.