I own several short mags and handload all of them as well as my other calibers. The short mag factory ammo is terribly expense, and I wouldn't own one if I didn't handload. It seems that the larger caliber short mags are more efficient than the smaller ones. If you check the handloading books, you will find that the 270WSM, for all it's great reputation, is not one of the more efficient shorties. In fact, for the ten grains of powder more that it takes to load the 270 WSM, the return in gained velocity over the standard, good old 270 Win is very minimal. If you like the .277 class bullets, buy a 270Win. - it does evertything that the 270WSM mag does, but a whole lot cheaper and with less recoil.