That SAAMI article is not relevant to 99.999% of shooters. Back when the 223 arrived, there were many P.O.S. rifles around that were very weak - like the Savage 340, 343, 24, etc - these rifles were originally designed for 22 Hornet level cartridges, and going up to the 223 was a stretch for sure, and it is the reason these rifles have disappeared into oblivion.
The 222 Remington is SAAMI rated at 45,000 psi for the same reasons - but if you have a modern 222 Rem, you know you can load it to 60,000 PSI without blinking.
So... unless you have some of the older poor quality rifles like a Savage 340 or 24, forgetaboutit!!.
Any "modern" bolt of and gas gun in the AR family will easily handle the 60,000+ pressure - all day long... year after year after year.
Military 5.56mm brass is not heavier or thicker than civilian 223 - both weigh around 91 to 93 grains.
Very old Lapua is ~100 grains - the current Lapua is ~ 92 grains, like everybody else.
PMC brass IS heavier, at ~100 grains, and max loads will be about a grain less.
Other than removing the crimp, treat Lake City brass like any other brass, and don't worry about sorting by the date on the head stamp, the date is NOT a lot number... they all come off of hundreds of different machines in a given year.