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For anyone loading .300 Blackout, starting with purpose-built brass makes the whole process smoother. This Hornady .300 Blackout unprimed brass comes ready to size and load, which means you skip the messy work of cutting down 5.56 or .223 cases, reaming, and dealing with crimped primer pockets. It's new, unprimed, and headstamped for the Blackout, so you're loading dedicated brass instead of reformed scrap.
Hornady builds these cases with the same attention they put into their loaded ammo. The brass gets measured for tight wall concentricity and uniform wall thickness, and it's checked for consistent weight and internal capacity. That consistency matters a lot on a cartridge like the .300 BLK, where the case is short, powder charges are small, and uniform volume keeps your velocities and pressures predictable from one round to the next.
The .300 Blackout case runs 1.368 inches at max length, and keeping your brass trimmed consistently is one of the biggest factors in reliable feeding and accurate loads. Many reloaders trim to somewhere around 1.355 to 1.360 for uniform overall length. Starting with quality Hornady brass gives you a clean baseline, and because the cases are built to hold up, you'll get more reloads per case before you see neck issues or need to retire them.
Standard practice is a full-length resize for semi-auto reliability, then trim, chamfer, and deburr before priming and charging. Since these cases arrive unprimed, you'll add your own primers, powder, and bullets to build exactly the load you want, whether that's heavy subsonic rounds for suppressed work or lighter supersonic loads for range time and hunting. The .300 Blackout rewards careful case prep, and good brass is where that starts.
No, these are new unprimed cases, not loaded ammunition. They're a reloading component, so you'll add your own primers, powder, and bullets to build finished rounds. This gives you full control over your load recipe.
New Hornady brass arrives at proper dimensions, so you can size and load right away. Max case length for .300 BLK is 1.368 inches, and many reloaders keep their cases trimmed closer to 1.355 to 1.360 for consistent overall length. After firing, check length periodically and trim if the cases grow past spec.
Forming Blackout brass from 5.56 or .223 involves cutting, resizing, trimming, and often swaging crimped primer pockets, which is time-consuming and messy. Dedicated Hornady brass skips all of that and comes with consistent case length and uniform internal capacity. It lets you focus on the actual reloading rather than the brass prep.
Yes, the same brass handles both. Supersonic loads run at higher pressure and tend to stretch cases a bit more over time, while subsonic brass often lasts longer. Many loaders keep their subsonic and supersonic brass separated to track case life and trimming needs more easily.
| UPC | 090255703276 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 86751B |
| Shipping Weight | 47.21 |
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