I'm developing loads for my 416 rigby. I'm trying to find as load as quickly as possible because of the price of this caliber. I have 5 diffferent load books that are giving me 5 different answers for the same bullet. I'm using jamison brass trimmed to 2.80. Federal 215m primers. Hornady 400 dgx soft point and h4831sc. My manuals go from a low at 93 gns start up to 107 max. They say that these are developing pressure under 45000 even at max. Problem is hornady says max is 99gns and hodgon says it 102. Lee says 107. I loaded a small batch at 101gn with oal at 3.60. The gun is a ruger #1. Before I go shoot I'm curious if you guys have any software that could guess as to where the pressure will be? Thanks for any help you can give.