Let's Talk 20 Tactical

[Paul's Black Rifles]

I short chambered a .204 ruger to the same length as .223 and then shortened a .204 sizing die about .100” basically a practical with a 30degree shoulder angle.

Simple and effective, run .223 brass through your die and load. Allowed me to do a .20 cal that has cheap brass with the existing tooling I had. Probably didn’t have to but made a new gauge with 30 degree shoulder. This was a match reamer with tighter neck, standard saami .204 leaves about .002” neck clearance on loaded round

That's exactly what I did, 5.18 by 45. Mine shoots fantastic! I have called it a 204 short but I don't want to offend Ruger.
I'm very happy with it. Cheap brass, easy to form, even shoots great fire forming. Just don't size the cases too short. The fix is a pain, making a false shoulder and fire forming again.

Paul