I do...I love the 300 short mags...I don't know how hard ammo is to find in the store because I reload.  Mine shoots well, but I'm not a bench rest, precision shooter either.  On bulls and muley bucks it worked well.  As long as you plan ahead or reload I wouldn't worry about ammo...but you are not going to roll into the little gas/sporting shop in podunk town and pick up a box of shells.
It is a less popular caliber than the .300 WSM...but is identical in performance.