What I did was copy down where the hash mark on the Rt or left side ends up I.E the closest one to a whole number or even halfway between note that number then if it is 2 clicks either way note that as well therefore when I am changing ranges say a 300M to 500M step I look at the book and go from there instead of going now its 5 clicks to 400 then 7 to 500......then someone talks to you whilst you doing it presto lost count lets go back to a 100!
Each 303 I have has its own book they all shoot the same load with the same projectile and that's it as I have seen guys get side tracked counting away and go from the front of the pack to dead last as in a comp you get 2 sighters and at 500M you would battle to see the splash if its over or short that's my practice and it works for me.
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