.223 wylde vs .223/5.56nato

I think it's just the throating......the wylde is in between .223 and 5.56. Just marketing hype.....
OK, found this.....seems like there is a market for the wylde chamber:
Now, SAAMI (Small Arms and Ammunition Manufacturer's Institute) long ago set its standards for .223 Remington based on bolt-action rifles chambered for this round. These bolt rifles were configured for varminting. There was, of course, originally a military chamber and round in use since the .223 Remington commercial round was renamed from the 5.56x45mm (NATO-spec) cartridge. The SAAMI chamber has a good deal shorter leade or throat than a military NATO-spec chamber. There is material elsewhere addressing the reasons this was a bad idea (SAAMI's bad idea), and it's become an even worse idea because it's never really been adequately explained to the folks--like you and me--who load or purchase ammunition for AR-15s. See, off-the-shelf AR-15s can have either chamber. Even worse, some barrels are not marked and some are improperly marked. Compounding matters (but not necessarily making them worse) is competitive use of AR-15s resulted in even more chambering options, and reamers. These came about when 80-grain bullets became available and immediately popular. The SAAMI chamber was too short and the NATO was too long.

So the rest of this will make sense, the following dimensions are all based on an overall cartridge length that will have a Sierra 80-grain MatchKing bullet just touching the lands when the round is chambered. We don't all shoot Sierra 80-grain MatchKings, and we don't all set them to touch the lands, but most competitive High Power Rifle shooters do both. At the least it's a "standard" that gives us a point to work from. What I call the "Derrick Chamber" (Derrick Martin of Accuracy Speaks) needs an overall cartridge length of 2.442"; the "Wylde Chamber" (for competition-use AR-15 pioneer Bill Wylde) is 2.445"; the "AMU Chamber" (for U.S. Army competition team) is 2.500". There are others, but these are the most popular among competition rifle builders. A SAAMI chamber is normally about 2.410"; a NATO chamber is normally about 2.550". Those are huge differences, and I counted five different reamers just mentioned here.
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prproulx, you might ask what's the diff between 5.56NATO/ .223 Wylde / .223 Remington, they're all different in throat length from longest to shortest.

.223 chambers have shorter throats than 5.56 and thus may have chambering/cycling issues with some of the larger .223 heavy rounds (like 77gn),the "wylde' throat is longer to help accomodate 223 with heavier bullets. 5.56NATO has the longest throat and will eat everything.

5.56 NATO has the longer throat and chambers all 223.
223 Rem chambers are not reccomended for 5.56 ammo.
Wylde is in between.
 
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