.223 Wylde is the chamber and not the cartridge.
Based off of a 5.56 chamber for use with 5.56 55gr ball ammo for the Canadian competition team in 1984.
They found it worked great with 69gr mag length ammo, 5.56 NATO, .223 and when the 80gr SMK came out it worked great as long as you didn't mind single loading.
FWIW my Wilson Combat .223 Wylde closes on a .223 (1.4636") but not a Colt spec, 5.56 NATO (1.4646") GO gauge.
I like to check headspace first when using a new bolt, less headaches and wasted ammo later on.
Same for the extractor spring, toss the o-ring and spring out and replace with a Colt Gold spring or BCM, Spinco at least, with just the insert, no O-ring.