Bob built a 20 Vartarg for me years ago. Great smith and good turnaround time. Will have him build another as soon as I find a fireball action.
I built the 20 Vartarg above on a Stiller Predator action. Feeds and ejects better than any of the fireball actions I have had. I never needed a second shot with it anyway, it is easily the most accurate rifle I have and I never miss with it. I had Bob build me a heavier prairie dog rifle in 20 Vartarg and just went with the single shot predator action on that one.