The original 210 and the more recent revised 212/220 bolt-action shotguns are totally different than the 110 actions and thus cannot readily be converted over to a centerfire rifle. The bore of the action and raceway is different, the bolt body diameter is different, the bolt head and front baffles are totally different, the extractor/ejector setup is completely different....seeing a trend here yet? About the only thing these shotguns have in common with the 110-series is a) the outside action diameter, and b) they both are fitted with an AccuTrigger.

As shoots100 said, anything is possible if you have enough knowledge, time and money to throw at something, but at the end of the day you're just spinning your wheels because if it was such a good idea someone else would have done it already and parts to do such a conversion would already be readily available.