mine seems to work just fine and i have shot out past 800 yards with it accurately, there is a small margin of error i am sure with most scopes. although my s&b pmII has dead nuts on adjustments so far.
so far mine have been repeatable and performed very well. I currently have a 4-16 on a 16 inch AR10 and i've used the same scope for load development on a couple of rifles.
Although repeatability is important to me, I want to know if I dial 10 clicks, that I'm not get 9 or 11. Though I use my mil reticle as a "ballistic" reticle.
I have not had any issues with my 6-24's I had done the box test on graph paper at 100 yards and 5 moa was 5 moa, both vertically and horizontally the impacts were as expected.
Although repeatability is important to me, I want to know if I dial 10 clicks, that I'm not get 9 or 11. Though I use my mil reticle as a "ballistic" reticle.
When I was shooting my old PST at 600 I think it was off by about 5% if I had to put a number to it. Like 1/2MOA for 13MOA of clicks. It always returned to zero though. That's why good shooters always tell people to work out their data on the range rather than with a calculator.