it is different especally at longer ranges 500 yards plus the difference is 16 or so inches and spreading the farther out you go... if under 500 yards like 1-200 there will be a 2-3 inch diff. 3-500 yards more like 6-9 inch difference... this is assuming the same bullet weight and the 300 win mag and 300 rum...
Yes, there are ballistics charts out there and Remington has some really good data.
No, these are very good guidelines but it is best to know what your rifle does with a specific load as variations in performance do exist from one rifle to another. There is no substitute for doing the shooting and checking out the results and this is especially true as ranges increase.