There are a couple good choices of actions for the Chey-Tac size cartridge. I prefer the 338-408 over the 375-408 simply because of bullet selection. I have a 338-408 and am more than happy with it's performance. My list of actions in order of preference.
BAT model M or L
Lawton 8000 or 8500
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Thanks for the advice Kevin , I can't wait to shoot that edge.that your building for me.. We will half to talk about the 338-408 . I get that edge paid for ,then proubly have to jump right back into another. Build.