There are many out there that will accurize(sp?) the 700. One company that I've dealt with (and highly recommend) is Accuracy Systems, Inc. I haven't bought any complete rifles (or had them build on my rifle), not because I don't want one, just haven't gotten around to it yet. They do produce high quality rifles, and rifle parts. They are known for reworking the Mini-14, but they now work on the 700 (among others).
I ordered parts for my Minis from them. At the time, they were in the process of moving (to SC). I still received my parts in less than a week. The parts that I ordered were already packed up when I called. Those two facts really impressed me about their customer service.
Like I said , there are many 'smiths that work on the M700. ASI is just one. Other people will chime in with others, but it's worth it to take a look at them on the internet.
Wyman