I’d get either a 6 or a 6.5 for shooting PRS Gas Gun series.
If you don’t mind swapping barrels every year, get the 6. If you want to double down on the barrel life, get the 6.5.
I’ve run a JP LRP 07 in .260 in many Precision rifle matches. It’s a good time, though I don’t believe there should be a separate series for gas guns. Honestly, many of the precision AR’s can keep up with bolt guns’ accuracy.
Why the Wilson over others? I know they’re a nice rifle, just curious what draws you to them over others such as JP, GAP, Spartan Precision, etc...
ETA - personally, I’d stay away from Vortex optics. I’ve seen way too many take a shit (had several of my own go down, not including friends and acquaintances). If you have PST II money, get a Bushnell DMR II or a Burris XTR II. Get a reticle with a Christmas tree/Horus-type iteration because many comps (courses of fire) will require you to engage multiple targets at various distances without dialing any of your dope.