The 25-06 uses a .473 bolt head. You could switch from the 25-06 to any calibers in the 308/30-06 family by switching the barrel. To do this, you would need an action vise, barrel nut wrench, go/no-go gauges, and the barrel.
If you wanted to switch to a 223 you would need a .373 bolt head. You can find these parts on Midawayusa.com
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