Midway USA isn't a specialty store; they sell all sorts of gun stuff.Of course you can find all flavors of WSM ammo at a specialty store such as Midway. You can also buy 404 Jeffery, .458 lott, .450-400, .470NE, .500NE ETC ETC ETC from Midway.
The trick is finding a box of .270 WSM at your local Wal-Mart or mom and pop sporting goods store once you realize that you dropped your box of ammo out of the truck back home once 100 miles away on a hunting trip. Not a deal killer just something to think about with the more rare WSM offerings.
Midway USA isn't a specialty store; they sell all sorts of gun stuff.