Have been across the course shooter for past 20 years and mid range (600 yard) shooter also...thinking about shooting some f-class. My question is how big is the x and 10 ring at 600 and 1000 yards..I know it is pretty small compared to NRA targets.. my question is what kind of power scope do you really need to see the 10 and x rings at these distances (600-1000 yards). Don't want to make the mistake as when I first started shooting 20 years ago when I bought something that was OK only to rebuy the right equipment 1-2 years later...Any suggestions welcome