Thanks for the replies. If anyone knows of someone in MD who can do this, please drop me a message or email.
The reason for doing this is that I have a Rem 700 SPS Varmint .223 that I would like to take to a country where .223 is illegal but .222 is alive and well and permitted (and I don't want to pay the price of a new rifle for a rebarrel job; if that's what it boils down to, then I'll just buy a CZ 527 or some used Sako and get rid of the Rem 700, which I like).
Thanks again!