Yeah, to be competitive, you want a PRS built rifle for PRS. Most people seem to be into some local PRS stuff and I'm not sure what all that entails, nor do I care to.
But if you are in a tactical div or production then you're already limited with what you can use, and open/production are the only two you can have a magnum. If you're shootings open or production the rules are a .30 cal with less that 32,000 fps, so you COULD rock a .300 prc but I've yet to see a regionals go past 1400, you won't need a magnum. Most dudes are running barrel burners with high bc bullets trying to keep everything on the hold and memorize their wind.