You're never going to know what the drag curve of a particular shot is going to be before you shoot (and measure) it.
To me the question is do you want to try to use old data gathered under different conditions or use poor data gathered immediately before the shot?
I think the real answer is both, you want to make a prediction using the best data possible and then update it every chance you get. Ignoring the chance to gather data with a Labradar and where the bullets hit on target doesn't make sense if it's available to you.
Labradar should allow you to true up the front of the curve, target data should true up the back and an "old" drag profile will let you extrapolate the middle.
It should be easy to see if predictions made that way are better or worse than just using "old" data only.
To me the question is do you want to try to use old data gathered under different conditions or use poor data gathered immediately before the shot?
I think the real answer is both, you want to make a prediction using the best data possible and then update it every chance you get. Ignoring the chance to gather data with a Labradar and where the bullets hit on target doesn't make sense if it's available to you.
Labradar should allow you to true up the front of the curve, target data should true up the back and an "old" drag profile will let you extrapolate the middle.
It should be easy to see if predictions made that way are better or worse than just using "old" data only.
