Swamplord just somewhat summarized the 300prc. It's an "optimized" 300wm without the belt, +50-100fps, with a case neck thats not .264" long in a 30cal magnum, thats designed to shoot 210-240gr bullets WITH a 9"tw barrel.
People make the 300prc out to be something it's not. It's not a speed demon! It's got a pretty tight chamber designed to shoot the longer heavier 30cal bullets about 3000fps.....that's pretty much it!
I can currently find 40+ different factory rifle models chambered in 300prc. That cannot be said for the 30noz. The ability for any person to go to their nearest bass pro and find rifles chambered in 300prc from $500-$5,000 gives the cartridge "staying power".
I don't own a 30noz but I do own a 300wm and a 300prc. I'm shooting .5-.6" groups with hornady match out of a "bone stock" Bergara HMR in 300prc. Smoked a 175# boar at 715yds 14 days ago. It does exactly what I bought it to do. Oh and I have CIP 3.8" length magazines in a $900 rifle. AND...I've bought ammo off the shelf at Atwoods, Academy, Scheels, Cabelas and even one box at Walmart "which I avoid like a crying woman" for less than $50 a box.
The 30noz might be faster but at a COAL of 3.40" you aint gonna get a 225gr bullet to stick out very far. And if everyone is talking about lighter than 210gr I'm gonna do that in my 300wm. If you are talking about 180gr I'm gonna do that in a 7mm.
Yes those are CONSERVATIVE ballpark numbers that I've given and other things are very possible with custom rifles and custom freebores and hand loaded ammunition. I'm a "worst case scenario" guy when it comes to factory ammo manufacturers ballistic numbers. I don't buy into hype and actually try to stay away from hyped up cartridges and form my own opinion based off first hand knowledge and forums just like this one.
If you told me to pick between a factory 30nosler and a factory 300prc I'm gonna pick the 300prc every day and twice on Sunday.