From taking a quick look at comparing different cartridges the 270 WSM is pretty comparable to the 7mm Mag except the 7mm mag has heavier bullet choices and is more popular.

From looking at the differences between the regular 270 and the WSM version it doesn't look like it would be worth it to me. The 270 has been around forever, and will always be, the WSM, maybe, maybe not.

Just for giggles I compared all the WSM rounds with their little brothers and they all get you about 100-200 fps faster speeds with the same bullets.

I have never shot all these types of rifles though, would there be any reason the 270 WSM might have less felt recoil than a 7mm mag? If it does that may be a reason to go with one over the other. Except I hardly every feel recoil when hunting.

Paul