Want to switch the .223 Savage out with a .204 barrel and possibly a .308 as well. My questions are this: Are the .204 and .223 bolt faces the same size? So all I would need is a barrel and proper headspace? For the .308, would I get a whole new bolt or could the bolt heads be swapped out or should I just get a whole new rifle? Trying to save money after the holidays but if I need a new rifle then I guess Ive got to get one! LOL. Thanks in advance for the input.