ballistically for 180g and down the 300win and 3000wsm are almost the same it isnt until you go above 180g bullets that the 300win has the advantage. the major advantage with the wsm is that you get a shorter action, shorter barrel and a lighter gun. to determine which is better for you look at browning for instance with the wsm you get a 23 in barrel compared to the 26in spout from the 300 win mag. this will make for a easier handling gun in tight situations.