I am not super familiar with the 300 Savage, but with most old cartridges you seem to have data for old guns and therefore lower pressures generally(300 savage was made for the model 99). The 6.5 Swede is like this. Modern propellants transform it into a great cartridge. Most of the time the data you see is knocked down as a CYA for the company.

Here's a few threads from another forum I am on.

http://forums.accuratereloading.com/eve/forums/a/tpc/f/4911043/m/6911008391?r=6911008391#6911008391

http://forums.accuratereloading.com/eve/forums/a/tpc/f/4911043/m/941100109?r=7581076801#7581076801

http://forums.accuratereloading.com/eve/forums/a/tpc/f/4911043/m/30110209?r=30110209#30110209