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300 blackout brass

Buy a jig and make your own. Pays for itself in the first 500 cases you cut.

You have to full length size and trim. So the only added step is cutting the 5.56 brass.

If interested, I will tell you my setup when I get out of the woods.

This, I do the same thing. Easy and makes shooting 300 as affordable as 556.
 
Black Mountain Industries Black Mountain Industries
This is the setup I got, don't remember the web site...Pretty sure it was less than $100 shipped.
The jig works great and took about an hour to setup and adjust so my cut brass is only .02 longer than needed for trimming.
There is a 300 blackout website that gives a list of all brass that works and the few that don't. (Case wall thickness will prevent the loaded round from chambering)
I cut about 500 at a time. Remove the primers, then sonic clean them. Full length size with a Hornady die, cut to length, chamfer, deburr and then I'm ready to load.
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This seller ships it with an extra blade and a catch basket as well.
Takes about 5 minutes to cut 100 cases, if that.
 
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