I have an ae mk2 with a nightforce nxs 5.5-22 zero stop. Currently my stick is zeroed to 168 grain fgmm. However I am thinking about moving past 600 yards to the 1000 yards range, and I hear for that purpose the 175 grain smks are much more stable. If my plan was to switch between the 168 and the 175 grain bullets are the zeroes much different at 100 yards? Or should I just switch to the 175 sell my fgmm, rezero, and call it a day? Anyone out there shoot two different grain bullets using the same zero?