How far you have your sight extended is really up to you. The ultimate extension would be 18m then you would really know whether you were pointing at the gold! The further out is better as more accurate, but then that could also depend on the size of your sight ring and your eyesight etc etc! Certainly if you have to bring the sight right in so it is very close to you eye you can only circle a fairly large part of the target.
One of the things to watch out for if you have to bring your sight in for long distances is minimising the sight adjustments you have to make at the change of distance. So if you have to bring it in for 90, and still can't put it all the way out for 70 put it out as far as you can for the 70 and then leave it there for the other distances so you only have to move the sight block up. It can be so easy to get a sight change wrong I always think you should keep it as simple as possible. YM2pW
