Help me out please. I am perplexed. I am reloading 7 mm Mag. I have Hornady 139 SST projectiles and H-4831 powder. My thought is with Hornady rounds I use Horandy data. With that said in a 7 mm Mag, 139 gr SST, and H4831 then the starting load would be 55.5 gr with max load at 65.0 gr. I have also been told to have 2 manuals. So when I check the Lyman book for a 140 gr projectile and the same powder then I see starting loads of 62.0 gr with max at 67.5 gr. And to confuse myself even more I jump onto the Hogden web site reloading center and they list the starting load at 64.5 gr with max load at 68.8 gr. I am probably making a wrong assumption but why would this be so different between the load data. Could it be their test rigs used? While I feel comfortable to use the Horandy data I am concerned about the large ranges seen in this example on the loading data. I know starting low and slowly working up watching for pressure is the right way I am concerned about too low a starting load. Thoughts please.