I don’t have any scientific data, but I would presume than 300 Blackout is one of the more popular rounds for reloading. I did jump on the 300 BLK train but don’t shoot it that much to justify my own reloading. As any reloader knows, most malfunctions are related to the ammunition. It could be deformed primers or brass, but as long as these can be kept out of the reach from your rifle’s chamber you’re fine. For the .223 Rem, I have a few of these stackable boxes, and they work really great. I also use Armanov’s ammo checker box for the .38 Super Comp.

Here is the description from Armanov:

Precision case gauge for .223 REM / 5,56 x 45 mm ammo or .300 AAC Blackout, made to tight tolerances SAAMI specification.

Machined from top quality aluminum with best reamers for you to sort out any faulty round instantly. It’s smartly designed to double also as OAL checker when you lay it on flat surface.

Since most malfunctions are ammo related, and most of those relate to deformed, bulging or otherwise defective brass – dropping the bullets into a gauge is an effective way to save time, trouble and reduce the chance of costly malfunction.

It’s stackable to any size in rows of 10 rounds. Depending on what sort of ammo box you use, you can use just one or tighten them together with 2 screws into 2, 5, 10 or any other size. Chambers are positioned precisely to align with MTM or most other ammo boxes, so you can easily transfer between them.

The Armanov case gauge is a real time saver and helps you produce reliable ammo.

The 10 pockets allow you to drop the rounds in a lot faster than into a single gauge, cutting your testing time down to less than quarter of the time! No more double work.

Here is a video to demonstrate the function (the only difference is the caliber).

The price is €39.00 or $39.00 for 1 piece (10 rounds). You can also order from the USA.

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