Get a spirit level jack and set it up and use it. Then do your windage indoors at 40yds. Then take note of the clicks and leave it there ( im assuming the t50 doesnt have turret caps )Don't go outdoors and convince yourself you need to change it. Fatal. 40 yds is 10-15 better than most ever get so you should be spot on.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep