Ruger.com shows the M77 mkII Target as the only model chambered in 6.5 creedmore. If you have been surfing the net looking for it the "vt" might be throwing the search engines off.
If you have been shopping by phone or in person you might have to order it. Some models are not made in large quantities until orders are placed. Took me 6 months to see the last new gun I ordered from Ruger, but it was worth the wait.