Being a fan of the 308 and 30-06, I was very much a skeptic about the 300 WSM when it first came out, and it took me a long time to finally get one. Now it's my go-to big game round. As others have mentioned, it's very efficient (I get 3000 fps using only 65 grains of powder with a 180 AB) and easy to load for. Cases rarely need trimming due to the shoulder angle. Recoil is reasonable and easily tolerated. And the round seems to be inherently accurate; my rifle typically shoots under 1 MOA all day long with a factory barrel.
I don't really give a damn what the sales numbers are doing - the 300 WSM does everything that I need from a big game round, and I have enough brass stocked away to last me until I grow too old to hunt.
That said, none of that will keep me from building a 7mm MSM.
