You'll need a new bolt head in .473(308 family). You'll also need a shorter firing pin if yours is the non-adjustable type. If your rifle is a controlled round feed action, transfer the extractor, ball, and spring from the old bolt head to the new one. Remove the standing ejector from the receiver and install a new ejector, spring, and retaining pin into the new bolt head. If your action is a push feed, just transfer all of the parts from the old bolt head to the new one. If you have the adjustable firing pin, you'd just need to adjust the firing pin protrusion due to the thinner lugs on the new bolt head.
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