Replacing bolt head

Heretic

Private
Full Member
Minuteman
Jul 1, 2011
148
136
56
Las Vegas
I am considering swapping barrels on one of my rifles and would like to go to 6.8SPC (.427"). Currently, the bolt is for 243 Winchester (.470"). Does anyone have suggestions on where to buy a bolt head for a Savage? Not having much luck with my google-fu.

Thank in advance!