Matt - I too also shoot the 221FB and the 17M4 (17FB). Three years ago I added a Cooper M38 in 20VT, and now it's the most shot rifle in my safe. I'm also a fan of the 204 Ruger, have four of 'em, and am now contemplating turning one of them into a 20VT also.
As far as accuracy goes, here's a typical target shot with my 20VT:
And our local rock chucks will testify to it's effectiveness using the 32gr Nosler BT over 18.5grs of RL-7 for 3,725 fps:
Go ahead, take the plunge....no one I know of who's made up a 20VT as ever regretted it. Less wind drift than most any 223 load, quiet, miserly on powder, no recoil, see all your hits/misses, wicked accurate and just plain fun to shoot. What's not to like?
Oh, and for premium pre-formed brass, Adam Bentley here is THE man to go to.....his brass is far superior to the R-P re-formed stuff. But like Mikie mentioned, be aware if you form your own brass, you may have to do a "clean-up" neck turn on your brass.......I know I have to. No big deal, but if you're contemplating the caliber, you should be aware of this one caveat. To me, it's worth the extra effort....what a great little cartridge!