Sorry, should have clarified. SAAMI has PRC OAL at 2.955", so a short action is out, so you're correct, unless running a Wyatts box. I built my PRC on a long action 700 with BDL bottom metal that worked just fine.

https://saami.org/wp-content/uploads/2018/07/6.5-PRC-Public-Introduction-6-28-2018.pdf