Take a 300 PRC and make it a 7PRC on a long action. Why? Wildcats are FUN!!!
We have experience making this exact round and with the high BC bullet offerings, it gives us the best of all worlds. We made it years ago now and its doing everything we hoped it would.
All we did is take the current 300PRC case/reamer print and neck it to 7mm and give it more freebore. Tons of components available, super easy to neck it down, super easy to make it run without worrying about case capacity, bullet seating, and overpressure issues at 90% plus case fill.
Running RL25 and currently 180 bergers at 3098 fps with plenty of room to go faster. With the BAT action, weighs about the same as some short actions and feeds perfectly.
Getting close to 7RUM velocities in a case that is more efficient. Able to run longer bullets without having to find/use a medium action like some of the SAUM issues and feeds better. With OTC rifle makers dont offer, to run long high BC bullets.