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If you load your own .300 Blackout, starting with brass made for the job beats cutting down and forming 5.56 cases every time. Starline's unprimed .300 AAC Blackout cases come to you factory-new with the correct length, diameter, and a verified flash hole, so there's no trimming headaches or conversion guesswork before your first load. These are genuine .300 BLK cases built from the ground up rather than converted brass, which means no forming stress baked into the metal and a cleaner starting point for working up a load.
Starline draws its brass vertically, which helps keep wall thickness variation to a minimum, and the cases are annealed between each draw stage for consistent metallurgy across the lot. That attention to the manufacturing process is a big reason reloaders keep coming back to the brand. The .300 AAC Blackout itself is based on a shortened 5.56x45mm case necked up to .30 caliber, and on an AR-15 platform you only need a barrel swap to run it. This brass uses a small rifle primer.
One of the big draws of the cartridge is its range of personalities. The .300 Blackout shines at subsonic velocities through a suppressor, but it's just as happy running supersonic loads for hunting and general range work. New brass like this gives you a uniform foundation for either path, with consistent necks and primer pockets that help keep your charges and velocities predictable. More bolt-action and single-shot rifles are being chambered in the caliber too, so this brass isn't just for AR builds.
Handloaders who want maximum consistency, long case life, and uniform headstamps tend to favor factory-new brass over converted or once-fired options. Feedback from folks running Starline .300 Blackout is consistently positive, with many reporting plenty of loading cycles before any issues show up. It's a solid, fairly priced choice whether you're tuning a precision load or just stacking up reloads for steady range time.
It uses a small rifle primer. The .300 Blackout is derived from a shortened 5.56 case, which carries over the small rifle primer pocket. Keep that in mind when you're setting up your reloading supplies.
This is genuine factory-new .300 Blackout brass made specifically for the cartridge, not converted .223/5.56 cases. Because it isn't formed from another case, there's no conversion stress in the metal and it arrives at the correct length and diameter. Starline also verifies flash hole presence on their cases.
The cases come new and within the listed 1.356" to 1.360" length range, so there's no forming work required like you'd have with converted brass. It's always good practice to inspect, measure, and chamfer/deburr as needed before your first load. Many reloaders also like to size new brass for consistency before charging.
Yes. The .300 Blackout is popular for subsonic suppressed shooting as well as supersonic loads for hunting and range use, and this brass gives you a consistent case for either. Just follow published load data for your chosen bullet weight and velocity.
| UPC | 810742022679 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 300BLKEUP100 |
| Caliber/Gauge | 300 AAC Blackout/Whisper (7.63x35mm) |
| Length | 1.356"-1.360" |
| Product Type | Rifle |
| Quantity | 100 Per Bag |
| Style | Small |
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