Okay, this in-put really helps. Especially since the rifle is in the mail still and not yet in-hand, the first-hand insight makes it easier to realize the size. Knowing this, the .222 or .357 family headsize makes me feel pretty comfortable. It will now be a matter of whether or not I can exicute a propper rimless extractor or not. If so, I think it'll be between 6x45, 25 copperhead, or 6.5tcu. If not, it'll be a 6mm, 25, or 6.5 on the maximum case or .222 rimmed as suggested. There's nothing special about the factory barrel (integral sights, mounts, interesting profile, etc) that would warrent a rebore, so I'll just replace and chamber myself, and these cases should allow a fairly lightweight shank diameter to keep the overall package nice-n-light.
Thanks again for the suggestions. I'll be sure to post some progress reports in return.
Ian
