As long as your savage still uses the barrel nut, you can swap barrels/calibers whenever you want as long as you have the tools. Headspace gauges (Specific to each caliber) barrel vise, and the nut wrench are the tools needed.
As far as identifying what you have will probably be difficult as the action is probably the only thing that is OEM. The trigger was probably replaced, the barrel, and the stock were all probably purchased aftermarket. You can find out what it was originally if you call savage and provide them the serial number off the action.
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