Cruzin, I would highly recommend the 300 WSM
with a Bartlein Barrel. Their .30 Cal, 1-10 twist is performing extreamly well with 190 to 210grn bullets. The 300 WSM is a great cartridge. My friend has a nice 300 WSM, he uses the 190grn Berger VLD. His rifle is deadly accurate out to 1500 yards, with that bullet. He has a 30", 1-10 twist Krieger barrel, and he pushes them right at 2900fps. He can push them faster, however, he said his rifle likes the 190grn VLD at that velocity. He uses his rifle for long range deer and PDog hunting. He told me he hit a deer, at 1100+ yards with the 190grn VLD, and it went right to the ground instantly. Lunching the 190grn VLD out to 1100 yards, with a muzzle velocity of 2900fps, still has a velocity of 1417fps and 847pounds of energy. That's some good stuff. I would recommend a muzzle brake
and 300 WSM Norma brass. Norma Brass is more expensive but it's worth every penny. Have fun and good luck with your build.