I didn't choose the action per se.... but the builder. I've had AHR build me two other rifles besides this one. It's what they do.... and do extremely well. A quick search on Accurate Reloading will find numerous threads regarding AHR and their rifles. The vast majority being DGR in .416 and bigger....
Aside from that, I much prefer CRF and the CZ is a good base for a build and is readily available and affordable.