Actually, I have not been able to come close to Nosler's load data even on the 180 grain bullets. Simply too much powder, too slow of powder, and not enough space to get it into if the bullets are seated to fit inside a Remington or Browning magazine. Even with 165 grain accubonds, I am running 64 grains of IMR4007ssc at around 105% density and only getting 3050 fps. I tried Varget up to about 95% density and got 180's up to 2850 before the quick pressure curve flattened primers.
I honestly don't know how Nosler can even get close to the speeds or charge weights they claim unless they are loading for single shots. When I tried their pet loads, the bullets got pushed out of the case about .020" after a few hours. Perhaps they don't check these things?
I've had no problem getting good speed out of 270 and 7mm WSM's, but the 300 is a bit of a paradox. The expansion ratio involved with it and the heavier bullets puts it in the powder rates of 760, 414, and imr4007ssc being ideal but I will not use ball powders but 4007 is not near as dense. I wish the 300 WSM was either .100" longer or .100" shorter in the body. All in all, the 300 SAUM is actually a better designed case in my opinion because of the powders and weights that can be used, plus it allows for slightly shallower bullet intrusion in the case.
