Good to see that the guys planning it came around and decided to have a rifle class I was takin' flack for proposing in that other thread, 10pages back...
I'd bring my 30-338Norma Improved, and not feel 'undergunned' by anything in the 18lb. class. As evidenced by Mr. Wheeler stating he's building a version for himself, reckon the word's getting out on what they're capable of?
Good luck! Now that there's a class for "us", might just trek cross country to shoot...even though dmoran ignored my offer to come shoot a 'PRS-type match' with me...
As for optic, I'd use the 5-25x56 that's on top already. Plenty of erector travel with only a 30moa canted rail, plus the ability to hold up to 10mrad in the reticle, itself. Meaning, could dial to a certain dope, then hold the balance via reticle...