The winmag is going to be alot faster than the WSM. I was able to get a WSM to push a 180gr bullet almost 3000fps, after several powders. But with slight pressure signs. I am able to push a 180gr bullet 3150fps with a 300win mag and with a 24" barrel. 150fps is pretty significant IMO. I know not everyone can get thiers to do this, but I was routinely getting 3050 with H1000, and RL22, and others.