We need to be asking ourselves as individuals, just what it is we are attempting to do with the information were looking for.
Certainly today with the information available on various sites, owning a chronagraph isn't necessary in order to learn the velocity of our load. Just remember that tomorrow it might not be, at least exactly. Thats just the way it is, and owning the best chronagraph wont change any of it.
A hunter leaving from say Florida, with an elevation above sea level of almost zero, can prepare a chart similar to those produced by Celltech for a Colorado hunt @ 7000' before he leaves Florida.
But he should only be looking at that as ballpark information at best.
Certainly those who get warm feelings by making first round hits, need to be evaluating lots of information for a shot before they shoot.
But as a rule, that dosent work very well when long range hunting for various reasons. And note I did say "as a rule".
So the important thing then is having the ability to gather the information you just saw happen, and fix it for the next shot, assuming there will be one.
Another problem for a hunter, could be not actually seeing what happened on the first shot, which is another subject.
Look at the 2 charts prepared by Celltech, and evaluate the differences in actual distance the bullet would land from the aiming point even with the big differences in velocity. Then ask yourself would that make much difference for your second shot?
And if it does, then thats where you need be focusing your attention, and not with having a perfect chart.