Well from my what I've seen 7wsm and 300WSM aren't too far apart, and IMO the 7WSM edges out the 300 comparing a 162 A-max @ 3000 and a 208 A-max @ 2800. I don't have my book sitting right here so my speed may be a bit off. The 7mm has less drop and drift. The 300WSM has about 10% more energy at 1k. The 7mm has over 100fps over the 300 at 1k. I haven't looked into comparing the 180 VLD .284 and the 210 VLD in the .308, it may favor the 7mm even more. The 270WSM @ 3100 with a 150 VLD has about 25% less energy at 1k than the 7mm. Drop is pretty equal and velocity is a little slower than the 7. I may be a little off on my WSM velocities, If I am let me know. I think more can be had out of the 7WSM with a 162, probably close to 3100. The 300WSM might be tough to make 2900 with a 208.