Well this went sideways. I thought we were having a friendly discussion. lol
Oh, I don't think this thread has turned unfriendly...well, at least for SH. lol
You came and asked a question...and yes, it was about how to torque on a CF barrel and not barrel material or contour. But you also told us you wanted to build a "300 PRC" because it was "best widely-available commercial ELR cartridge in .30 caliber" which certainly implies that you want to shoot long distance. And, you seemed to indicate that this was a range toy and not a hunting or competition rifle like for NRL where you got to hump that thing around.
So, given the above you got the obvious responses. Many of these responses are from highly experienced gunsmiths, competitors, and just people who have built a lot of long range precision rifles (and no, I do not include myself in the expert column).
The responses basically came down to questioning WTF you want a CF barrel on this rifle as there is some downside and, given your use case, just about zero upside.
Yep...your money, your rifle, you can certainly do as you please.
But you def had your mind made up and def didn't want to hear crap about barrel material/contour from people who have built a lot of rifles for the purpose you indicated.
Have a brilliant day and best of luck.