I just did a bunch of digging while researching a STW build. You can build it, by changing to a magnum bolt head. Due to the length of the 8mm Remington Mag parent case, you won't easily find a magazine that will allow you to get the full potential out of the new chambering. Savage did manufacture some longer length magazines, but they're tough to find. COAL for the Alaskan is 3.600". You might get 3.400" out of your 7mag box. Stuffing the short, fat .35 bullets into the case an additional .2" will reduce your powder capacity somewhat, but it should still be able to take any animal on the planet with the right bullet and proper shot placement.