I was reading this thread and "scratching my head" in disbelief relative to 308 Win. pressures increasing from 52K to 62K range in recent years under SAAMI guidelines. Especially, since SAAMI seems to have reduced pressures (and thus performance) for almost everything over the last 50 years.
It has long been known that PSI values obtained by Piezo Transducers are not exactly the same pressure values obtained using the older copper or lead crusher cylinder method. However, few (including myself) realize that these values can vary from 52K to 62K depending only on the measuring method used.
For those with serious academic interest, go to: http://kwk.us/pressures.html