I've been blessed to live and hunt in CO for 25 some odd years. As a family we have killed a lot of critters here. As has been mentioned, bullets matter more than headstamps. If I didn't reload, I'd buy only a 7mm Rem, a 30-06, a 270, 6.5 PRC or 6.5 Creedmoor. Then buy a Tikka, a Nightforce NXS 2-10, Sportsmatch rings, and start shooting. If the gun liked one factory ammo a lot, I'd buy 10-20 boxes and be set. Nice thing is if the first Tikka doesn't shoot great, sell it for a hundred dollar loss and buy another Tikka.
If you buy a 7mm PRC, the ammo costs are going to preclude you from shooting enough for it to be worthwhile. Spend the money saved on other hunts or family.