223 wylde chamber pressure

[Koda]

My google-fu isnt working on this questions.

Whats the pressure rating for the 223 Wylde chamber?

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Chamber	Freebore Diameter	Leade Length	Maximum Pressure
.223 Remington	0.2240"	0.0250"	55,000 psi
5.56x45mm NATO	0.2265"	0.0566"	62,000 psi
.223 Wylde	0.2240"	0.0619"	Under 62,000 psi

 

[Koda]

what does "under" mean, is that like a "MAX" tolerance callout?
Isnt there a source for this info?

 

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This is from Wikipedia:

However, the cartridges are loaded to different pressure levels (55,000 psi vs 62,000 psi), with the 5.56 NATO being greater.[5]​ The .223 Wylde chamber allows the use of both pressure levels safely, while also increasing accuracy potential across the range of potential bullet selections

 

[Koda]

yeah, I read that, I read it differently but suppose thats as close as I will get to an official PSI.