The NATO chamber has more free bore to reduce pressure in high pressured NATO loads. The Wylde has a tad less, 223 even less.
I don't think that's right. Compared to the 5.56 Nato, the Wylde freebore is longer, but smaller diameter for better bullet alignment (.224" Wylde vs .226"-.227" Nato).
This is what the chamber specs say, and matches my own experience with these chambers. For example I've never had a Wylde chamber that I could load to touch or near the lands at mag length.
The Wylde chamber was originally designed for the longer 80 and 90 gr bullets loaded for single shot use, hence the longer freebore.
