Nice pic, Shortaction.
idbltap, The 300 WSM is a short action 300 Win Mag. Would you go coyote hunting with a 300 Win Mag? Most people wouldn't. You may want to. Your choice. Some people hunt whitetails with a 375 H&H. Not my choice, but hey, whatever.
The 30-06 is a good standard to start at in terms of performance and capability with the 30 cal bullets. Do you want your bullet to travel another 150-200 fps faster? Then get a 300 Win Mag. Do you want that same speed, but in a short action? Then get a 300 WSM.
I have a 300 WSM and I like the round, but it is nothing new, in terms of ballistics. It does what the 300 Win Mag does. It just does it from a short action platform.
So if you think coyote hunting with a 300 Win Mag is a good idea, but you want to do it with a short action, then the 300 WSM is what you need.