I have a Vortex PST II 5-25x50 mounted on a 0 MOA EGW rail. I typically shoot out to 600 yards so the rail is more than adequate however, I have a chance to shoot on a range that has targets set up at 1,100 and 1,300 yards. My scope has 192 remaining clicks or about 50 MOA so I have been thinking of putting a 20 MOA rail on. If I do, should I be planning on a 200 yard zero instead of 100 yards?