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if im not mistaken that would re class it to either a restricted or prohibited class depending on barrel length ext since you are modifying it to shoot a diferent calliber witch is not on the antique status list.
but i imagine you would just have to bring it to a gunsmith and see what he can do. the chamber-cylinder alignment would probly bee a pain in the @ss to set up though
Think about it; a sleeve would only leave about .050" thickness on either side, that isn't enough to work. I'm sure a small chamber adapter could be made to let you fire it, if you were willing to have the .222" bullet rattling down the .32 bore.