If I was to recommend an action to build off it would be one of the two:
TacDriver - with a lapua bolt and cheytac bolt
10x - with a lapua bolt and cheytac bolt
With that you can go from lapua bolt face cartridges (300NM, 33/37XC, 338LM) and cheytac bolt face cartridges.
Both actions are good. One is more budget friendly and the other has some unique features.
But the main problem is that lapua based cartridges are generally light class cartridges (338LM, 300NM, etc.) and cheytac based cartridges are heavily class cartridges (375CT, 375SnipeTac, 416CT, etc.)
So, what weight do you want the rifle to be: light or heavy. If it’s greater than like 25-26lbs and > 338cal then it’s a heavy class rifle. Just keep that in mind.
I am a fan of practicing ELR with something like a 300NM and then stepping up to a 375CT for competition. 300NM is cheaper to practice with, harder to spot shots, etc. so it makes a good practice cartridge.
Disclaimer: I’m speaking in generalities because I don’t want to post 9000 caveats. When speaking in generalities you lose accuracy. I don’t want to type a research paper just to split hairs.