Nobody here is thinking far enough outside the square - brass is gay, want more speed throw away the brass, buy a yellow bastard and toss a 250gn pill at 3850fps. If you build a complete system around max velocity and specify an action to take the bolt thrust you are sorted.
Shoving big cases into rem's etc all seems a bit like boy racers putting kits on nana's old mitzi to me - its never going to be a race car, if you want a race car go build an effin race car...
As for the universal reciever I suspect that building one would be easier than importing one (and paying for it)
Big block of steel, bore hole through and thread both ends - front one gets the barrel with extra long tenon (with savage style barrel nut for headspace) back end gets a breech plug (2 inch HT bolt with fine thread should hold a few kpsi). Firing pin drilled through the bolt centre only needs to float free and project just past the end of the plug in either direction, simple spring loaded striker to fire the round - hint dont stand behind it if a primer pops, could possibly put in a safety feature like a curving up bracket behind to send it skywards. If you want to explore MAAAAX pressures chamber the barrels deep so cases fit flush like a pistol, headspace by winding the barrel down onto the plug. Sorted
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