I just started PRS this year with a Gen ii razor 4.5-27 because sites like this and youtube say they are so great. I just don't like them for PRS. They are a great heavy and mean heavy duty scope, just not for PRS. The turrets are probably my least favor aspect of them. I sold it and got a Tract 4-20 and love it. Around $1200 and the glass and turrets are better IMO. I plan on putting the 20x on my AR10 once the new one comes come
Mag range 5-25:
You probably will hardly go over 15x but when you need that 30 you need it.
I really only needed to but up around 25x for one stage, but I can live with 20x until they release the 5-30x56 in June.
Turrets:
I would say you may run into the need for locking turrets, it's just how careful you are handling your gun. The vortex turrets lock like crazy.. but if I had to dial during a stage, I would leave them unlocked. The Tract unlock really easy.
Reticle:
Hardest part of PRS is the time. Some stations have just one target with 5 positions, some have 6 or 7 at different ranges from one position. So dialing or using a reticle is huge. Some stages you can hold for range between targets if they are a good round number and some you can't. Other other part is wind. If you are shooting one target from many different positions, you can just dial your wind. If you have multiple targets are different ranges, most people hold for wind. Any of the Christmas tree reticles is what you need to look for, just find one your like.
The trend at the matches that I see are Kahles 624s, Nightforce ATACRs, MK-5s, ...The Athlons and Tract are just as good as those for half the money.
The other scope I would recommend is the Athlon Ares ETR, around the same price range.