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Think I have it figured out but I wanna make sure. I have a 12fv .308 and I want to switch barrels.
The case head for .308 is .473, so does that mean i can switch barrels with a .473 sized case head
and not have to switch bolts. And also what are my tolerances for case head size matching up with bolt.
I noticed the 22-250 is a .472.
Your 473 bolt head will be fine for any cartridge, except rimmed like a 30-30, or a magnum , short mag, or a 223 variant (222, 204), or some huge T-rex.
The 22-250 will be good to go.
Savage bolt heads are a little generous in their diameters so you may have to replace the extractor ball with a larger one so the case will be reliably extracted and ejected.