338 ARC – 170 gr MonoFlex – Hornady Black (82273) – 200 Rounds

The 338 ARC gives AR-15 owners real big bore hunting power in a suppressor-friendly package, and a lead-free supersonic load makes it a true deer and hog rifle. This listing is Hornady Black 338 ARC 170 grain MonoFlex ammo, MPN 82273, sold as a 200 round bulk case.

The MonoFlex is a solid copper alloy bullet with a polymer Flex Tip that fills most of the nose cavity, giving it a streamlined profile and consistent expansion. Because it is a monolithic bullet, it retains nearly all of its weight and penetrates deeply. Hornady rates this load at 2,075 fps with about 1,625 ft-lbs of muzzle energy and a G1 ballistic coefficient of .314.

The 338 ARC (Advanced Rifle Cartridge) is a newer Hornady cartridge built for the AR-15 platform and standardized by SAAMI in 2025. It fits a standard AR-15 lower with a 338 ARC barrel, a bolt and magazines made for the ARC case family. A common question is whether 338 ARC is interchangeable with 300 Blackout. It is not: the two use different cases and bullet diameters, so only fire this ammo in a firearm marked 338 ARC. The cartridge was designed around suppressor use, and Hornady offers it in both supersonic and subsonic loadings. Its .338 inch bullets range from lighter supersonic hunting loads to heavy subsonic projectiles, so one rifle can cover deer and hog hunting at moderate range as well as quiet suppressed shooting. Because MonoFlex is lead-free, it also works where non-lead hunting ammunition is required. A 200 round case covers zeroing and hunting.

Hornady Black 82273 is new production ammunition, not reloads, made in the USA. Each cartridge uses a brass case with a boxer primer and is non-corrosive, and the boxer primed brass is reloadable for handloaders. Buying by the case also keeps you on one production lot, so point of impact and velocity stay consistent from box to box. This case comes in factory packaging as 10 boxes of 20 rounds for a total of 200 rounds of 338 ARC 170 grain MonoFlex (Lead-Free).