For those of us in NJ, this cartridge is the answer to a question that we can't ask.
We can't hunt with rifles and we can't shoot past 600 yards.
For the guys out west of us, this is an awesome cartridge that will smack medium sized game down at 500 yards. It will also serve well for the ELR guys out there shooting steel at ridiculous distances (That said, the 6.5Creed/6.5x47Lapua/.260Rem will do a mile) .
The biggest factors that will limit folks getting into it will be brass and expense. Brass will be a sticking point as the Hornady brass does not have the greatest reputation. I've honestly never heard of ADG Brass so I can't comment there.
I'm like @Shane45 where I'm not sure where this cartridge lies, but that's true with a lot of cartridges IMHO. The overlap and redundancy in cartridge availability is kinda mind boggling, but the variety is where the beauty is. So, yeah, it's cool and all, but I don't think I'll be on this bandwagon any time soon.
It also looks like it takes a magnum bolt face which could be a large negative factor in the cartridge catching on. You can't just build it on what is considered a "standard" short action in which the bolt face is .473. Short action/magnum bolt face actions are not always easy to come by...
From the Hornady website:
"Dubbed the big brother to the 6.5 Creedmoor, the 6.5 PRC fits in short or medium actions with a standard magnum bolt face (.532”). It’s efficient case geometry features a long cartridge case neck and 30 degree cartridge case shoulder."