Lurker,
I have seen the Wylde chamber described as an attempt at a “5.56 Match” chamber. Basically an attempt to improve both .223 and 5.56 accuracy when used in the same chamber.
It's the 'heavy barrel', so I'm not too concerned about the pressure differences.
I now reload using .223 dies and a 62 gr. soft point bullet for 'social' work.
L