223 Rem to 300 AAC Blackout Trimming Fixture
grabcad
A straightforward 6" fixture block designed for trimming 223 Remington cases down to size for 300 Blackout on a milling machine. (1) Size cases through a 300 AAC die without engaging the sizing button or decapping pin.(2) Load the sized cases into the fixture and secure them in a milling vice.(3) Set the mill height at zero on the boss located at the end of the fixture, then mill all cases to an identical height.(4) Remove burrs from case mouths and reload.
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