I understand where your coming from. Most issues with pressure while using the 1-1/16" tenon are from barrels utilizing a barrel nut, at least from my research. I plan on running a 1.2" straight bull on my future build. I am actually half tempted to try and get a lapua bolt for my defiance action and build off of it. I am not sure I will be using the CDG for that build. I just wanted a confirmation from ARC.I don't think the question is whether the CDG action can handle that cartridge or not. The big question with the larger cartridges is if there's enough "meat" in the barrel shank and surface area on the lugs to adequately handle the pressure to prevent from pressuring out early.
My understanding (I'm not a gunsmith or ELR action designer), is that larger cartridges like the 33XC and up can show signs of pressure early in actions that have "undersized" lugs (for the cartridge) and thin shank walls around the chamber.
It's not so much a matter of if the CDG can handle a 33XC, but more so if the CDG can adequately handle the cartridge without showing early pressure signs.
I still plan on getting one either way. For what who knows. I am never satisfied with what I have and always want something else to try out.