I too have thought about F class and already have the rifle and scope, just need to get off my a ah er rump.
Remington 308 LTR with 30 mm dia Leopold target scope. I've shot this rifle at a any rifle any sight 600 yard match. Did OK but using the bi pod would have been better.
Having good glass is important. Shooting 600 yards is not at all like shooting at 1 or even 200 yards. If it's a calm day, then it’s not too big of deal. A puff of wind comes along and suddenly you just shot the target next to you. Not saying you need to spend $1k but good glass isn't going to be found on your deer rifle. Buy once, buy smart.
God Bless our Troops especially our Snipers.