The Wylde chamber is very different than the 223/556 chamber. The lengths are different and the shoulder angle is different. The Wylde chamber is fatter and shorter than the 223/556. That is why I say you need a custom die.View attachment 1008792
Compared to the 223/556 you are shooting a 223 in an "Improved" chamber.
Question for sheep dog. I see a wylde reamer posted (Manson reamer are excellent IMO); what's a standard 223 shoulder angle?
-Mac