Can' t say I' m doubting anyone' s accuracy, but those ballistic charts look EXTREMELY optimistic to me. What RKenSparc said is very true and in some of the cases presented in the ballistics charts you would also have to adjust for " bullet rise" at closer ranges!

The only way to know what your load will do in your rifle is to shoot it at various ranges and shoot it a lot, particularly if you want to stretch your range. I have one rifle that I will take (and have taken) a 200 yard shot with if all conditions are perfect.