Re: 100yd sight in for 600yd zero?
I would recomend a Zero @ 100 yards and then shoot at 200 or 300 using the same hold.
This will tell you the true trajectory of your load (Or Close) then using the ballistic tables
and your 200 yard drop you should be able to print paper @ 600 yards.
I still like getting as many Zero's at different yardages as possible but some ranges only have 100,200, and 300 yard ranges so you have to use whats available.
Once you establish a good 600 yard zero the ballistic tables will help to find the 1000 yard +
distances because you now know the true velocity and Ballistic coefficient instead of what the
bullet maker claims.
J E CUSTOM