Ran some numbers on the Berger Ballistics Calculator.
24 " x 24" target is 1.36 MOA square at that distance.
Front iron sight covers 5-7 MOA
5 mph cross wind drift from 9:00 o"clock based on very similar to GP11, Berger 175VLD bullet, at GP11 velocity from a K31, gives:
Left drift of 193.25 inches at 1800yds, T.O.F 4.23 seconds
Left drift of 171.95 inches at 1700yds, T.O.F 3.87 seconds