The only load i have worked up so far for my 300 WSM is 64 gr. of IMR 4350 with 165 Nosler Partition. Accuracy with this load is decent but I think i can do better. I am about to work up a load with RE19 and 180 gr. Nosler solid bases. So we will see how that goes. I don't have a chrono so I couldn't tell you the velocities but I will let ya know how accurate the 180's are out of my Tikka.