The 270 WSM is in my opinion the best of the WSM Family, it made the most sense. I have owned 2 of them over the Years, Tikka T3s, The very first WSM i owned was the 7MM and it was a Winchester Model 70, It was an Ok Gun, But Nothing spectacular Ballistic wise. I handloaded for all of them, Hodgdon 4350 would have been the powder i used, I remember Loading the 140 Grain Nosler Accubond bullets in the .270s, Accuracy was always my goal, The Slower Burning powders such as Hodgdon’s Retumbo, and H-1000 Gave slightly better Velocities But were also Compressed Loads which I’ve Never liked. I always looked for a Powder that gave a Load Density in the mid/upper 90s, Close to 100%