I'd recommend taking a close look at a .300 WM Tikka.
I've read a number of articles that say that in a number of tests, mag. short calibers have not performed as well in the tightness of shot groupings as the same caliber and rifle in the standard size brass. I personally see little advantage to a short mag. other than a slight different in bolt travel.

To tell you what U.S. Military thinks of accuracy of calibers. The predominant sniper training and rifle they use is .300 WM for accuracy. I know they have .50 rifles too. But those obviously doubt translate into civilian rifles for hunting purposes.

I've found .300 WM Tikka with a very good quality scope and premium loads to be excellent (sub 1 MOA) at 100 and 200 yards.