I have a Proof rifle in 300PRC, 24”,1:9” Twist. 215 Bergers, Lapua Brass, H1000, FED215M primers. Shoots lights out. Only tested to 800 yards so far. It’s an absolute dream. 2885 FPS.
Great caliber for elk. Watched dozens of bulls taken with the 300 WSM. Just make sure it’s chambered in a reputable rifle. I’ve seen them be a huge pain in the ass if you cheap out on barrel, action, powder, brass, bullet, etc etc.