I'm not sure which M-223 scope you have but let's assume it's the 4-16 model. Put the scope at mechanical zero. That scope has 40 MOA of internal adjustment or 160 clicks. Turn it all the way up or down, then count 80 clicks, you are now in the middle. Start making adjustment's from that point. I wouldn't do anything with the scope after that until I put a shot on paper. Then I make my finer adjustments and when I'm happy with my 100 yard zero I lift the turret up and turn it to 100 and push it down to lock it in place. See if that doesn't work for you6x47.