psteinmayer wrote on Mar 21^st, 2019 at 9:29pm:

. . . I need to know what height I need to be able to use the 600 yard setting on the rear sight for 1000 yards.  That way, I can go up or down to fine tune things! . .

Sounds like a good idea, giving you some leeway if you need to come up a bit and don't have time to start filing on your blade. To calculate this, we need to look at Bob S's table of MOA values for the A3 sight at   (You need to Login

Adding up the MOA values for all the graduations from 200 to 600, we get a total of 16.5 MOA. Looking at the ballistics for a BC ~.500 bullet at ~2650 fps, we find we'll need to come up about 36.5 MOA from 200 to 1000. Since the 600-yard setting gets us only to 16.5 MOA, we get the remaining 20 MOA with a shorter front sight. One MOA change requires a .008" change of the sight, so .008" x 20 = .16". You'll need a blade about that much shorter than your existing one. That will look pretty short compared to the issue blade.

Now you can check the new blade at 100 yards by setting the elevation to 600 and looking for a group ~39" above center bull - or ~74 at 200 (presuming a MV near 2650 fps and BC near .500.). If using a 6:00 hold at 100, use a 4.4" aiming black to emulate the size of the 44" LR target black at 1000 yards. At 200, use 8.8" bull.