My question regarding Max loads is one of my reloading manuals. Lees modern reloading 2nd edition shows a max load of 22.4 gr. of 1680 with a 180 grain jacketed bullet pistol load with a pressure of 37,000 PSI. When I go on the Hodgdon web site it says for a 180 gr SSP bullet max is 30 gr. of 1680 with a pressure of 27,000 PSI. Which is correct? And why such a huge discrepancy in pressure it make no sense 7.6 more grains equals 10,000 PSI less PSI.