Most reloaders have no pressure testing equipment, so we go by the looks of the brass, primer, web expanding measurement, bolt lift, hard extraction. Some use a chronograph to help get an idea. Compare loading data in manuals & online.
http://data.hodgdon.com/main_menu.asp A computer program called QuickLoad,
http://www.thehighroad.org/showthread.php?t=685303 may also be helpful to get a reading on pressure.
http://www.sniperforums.com/forum/of...-software.html