I'm just going from my experience with my rem 700 HB. The Cadex tightened up the group. I understand the Tikka stock is a better stock though. It's not the check riser I'm after but I like the Cadex tacticool look also. I'm not much into the traditional hunting rifle look. I know 3 at 300 shouldn't be difficult and it's just a starting point. I know I could've went with the RPR and been done with it but the initial reports weren't that promising and no 7mm turned me off that idea.
Cool, just a heads up.
The cadex stock will not show an improvement like you'd see from an aac or sps 700, as their stocks are pretty well known for being train wrecks as far as floating the barrel. Your rifle will easily meet your accuracy expectations as is. I'd just shoot as is and move it into a full suite chassis when it's affordable for you.