I am still pretty new at this so bear with me. Last year I built my 1st gun ( a Savage of course ) I started with a hog hunter .308, bought a 6mm br barrel from McGowin and a thumb-hole Varmint stock form EABCO. Had a blast & can switch back & forth between the two calibers fairly easily. Now I want to try this on a long action. I'm thinking of starting with the Savage Bear Hunter in 300WM (really cool gun) and I'd like to buy a .280 ackley improved barrel. I'm pretty sure that I'll need a different bolt face, but other than that can these two calibers interchange on this action?