The 7 PRC seems to not live up to the velocity claims by Hornady. Looking at reloading manuals they are showing the ~ velocities that Hornady says. For those who have reloaded for it can you get the claimed velocities with a 24" barrel?
www.24hourcampfire.com
Hopefully some more info pops up in that thread for you.
From what I've gathered, the original Hornady factory loads were pushing 3000fps in the 175 ELDxs out of a 24in bbl. But they were over pressure and had so many returned to Hornady shot in all kinds of rifles so they revamped their factory ammo, and most are only getting 2750 to 2800fps from the 24in bbls from recent lots of the factory ammo. But the new factory ammo is VERY mild compared to what the original stuff was. Folks pulling factory ammo right now are seeing 2g less powder under the 175 eldx's compared to the current factory Hornady ammo 180g ELD-M ammo. And the current Federal factory ammo is giving 2900-2950 from the 175 eld-xs without blown primers or ejector marks. (These are from non Christenson arms rifles).
Again, from what I've gathered, I should be able to hit 2825-2850 VERY safely handloading with a 22 in bbl for the 175 ELD-x's and 2800 from the ELD-Ms.
My problem is the crazy erratic pressure. Work up a load that is safe, shoot a dozen with no problems, then come back out and shoot the same exact load which was produced at the same time as the prior loads, and completely cook the brass and ruin it. In retrospect, I was seeing this with the original breakin handloads with a VERY mild 150g ballistic tip going only 2800 fps... even one of those was overcooked and brass toast. I originally thought it was due to cheap/ soft Hornady brass and dismissed it as a fluke. But optimal powder charge testing was showing the same thing... excess pressure well under book, then no pressure working up, then pressure signs, then no pressure signs working up, then gas blowback around the primer pocket out of the blue. I've found over a dozen instances of Christenson Arms rifles chambered in 7prc doing this. And also the Fierce rifles. Noone else having these problems.
Christenson arms customer service were very nice over the phone, and while they did not admit the issue was their fault, they didn't give me the run around and are paying for shipping both ways to look over the chamber. When I specifically asked him about this rifle in this chambering, he said he has seen this issue a 'few' times. Which means to me they are having major issues from their prior reamer in 7PRC. I asked him specifically if my serial number was in the area with all the problems, and he said he is just in the customer service dept and doesn't really know.
I suspect they are trying to keep it on the downlow to prevent a big hit to their reputation.
