Have 2 Rokstocks Ultradyne and Hnt26 stocks. The RS with its forwarded mounted rail system is good for a bipod but I don’t care for it clipped in a tripod. I would mount a mini arca closer to the mag well. RS handles great off a bag which is how I prefer it and I really like the vertical grip and LOP fits me. Using the RS you will need to upgrade the bottom metal or do something else for magazines if you need more capacity or want to run longer coal than stock Tikka stuff.
The Ultadyne use AICS mags so that’s a plus, it has a full length arca and it’s fairly light.
The recoil lug is by far more stable with the RS. Bonding the recoil lug to the UD chassis would be best.
I feel using a tripod for rear support a chassis stock is easier to get stabilized. Using bag for rear support, I think the RS has the advantage but I haven’t completely made up my mind yet.
I switched back and forth between the two and the RS proved to be more accurate.
Recoil management goes to the RS in stock form but the UD chassis you could add weight, which would make it handle better because it feels a little lighter in the front.