Thanks! I found it. I'll ask what he knows but he said in the post that he got it from a friend who's cousin is a gunsmith who rebarreled and chambered it when he was in school. Maybe I can contact his friend's cousin.
I also found a thread on another forum by a guy who was converting an sks to 6.5 Grendel. It was from 2008 and doesn't show him completing the project. He swapped the barrel then showed how the 6.5G is longer than the 7.62x39 and wont fit the stock magazine, then the thread ends. I'll try to contact him too.
Weaponeer Forums: SKS conversion to 6.5 Grendel