223/556 are virtually the same outside case/die dimensions. 223 is what it is set up for.
Edit I was in a hurry when I wrote that.Will this work for 223? Won't allow 5.56 for three gun where I shoot.
223/556 are identical outside dimensions of the case, most 556 brass is thicker and it is loaded to higher pressures than 223. It is not recommended to fire 556 in a 223 chamber unless noted by barrel/gun manufacturer that it is acceptable.
This press is set up for 223 and 300 Blackout. (same parent case just different dies and powder measure) quick change kit minus dies included in what I have.
I hope that clarifies things for you.
Thank you,
PH