I built a 7 PRC on a Howa 1500 action. It's a 22" barrel and I shoot suppressed.
Factory Hornady 175 ELDX ammo shot about 2930 FPS from my gun.
My reloads with N560 powder, Hornady 175 ELDX bullet, with Hornady brass shooting a ladder test I had velocities from 2940-3060. I worked those loads up in Gordon's Reloading Tool and my brass showed no pressure signs. I'm probably going to choose the lower charges for my loads.
While Hornady factory ammo isn't living up to their advertised velocities because they had to switch the powder they use you can absolutely get max performance using N560, N565, N570 powder.
I’m loading 175g Berger EH, N568 and getting 3140fps. And it’s a shooter.