Where did that come from, Swifty? I'd like to look it over if it's available on line.
I need to find the documents I've downloaded and see if I can find info on the other 5.56 loads. Based on the above, there may be a lot more variation within the 5.56 family of cartridges. Unless the specs for M193 have changed since 1994 I would stick with the opinion that it is loaded to the same pressure as SAAMI-spec .223 Remington, but maybe M855, SS-109 or other variants are loaded to different specifications.