Here's what I have in 17 mach 2:
http://www.magnumresearch.com/Expand.asp?ProductCode=MLR17M2BFCThey take a 1022 action & build these rifles. I've never shot anything more accurate.
I'm not familiar with converting but there's more to it than just changing bbls. At the very least extra weight has to be added to the bolt to asorb the higher recoil in the .17's.