Need a few ideas for tracking shots during load developments that go through a wide swing of velocities. When I develop loads it tends to be large and cover a lot of velocities and the bullets have a lot of drop/rise. For fine tuning a chosen load, a panel of targets in a 3x4 configuration works perfectly. For the large velocity test on a riffles zeroed at 100 yards with a given load ( same bullet, different powder and charge, and velocity) that first shot could be up to 16 inches low (hitting the target that is 2 rows down) and then go really high as the shots progress. This becomes a problem when some groups cause bleed over or cross over. Worst case is when shots miss the target completely because my riffle is zeroed for x bullet going 2500 fps and i tried to hit a target with the same bullet going 1200 fps.
I have tried playing shot bingo. Take a shot and mark it on a scaled down version of the target with all shots taken at the point of aim. It is a pita looking through a spotting scope for holes smaller than a pencil from 100 yards away. Could i use Quick Loads to estimate velocity and the use a ballistics program to estimate drop or rise to better position targets? Wish i had a target cam but that's too expensive. This is also a public gun range i shoot at so i try to minimize cold ranges as to not be an inconvenience to other shooters.
I have considered shooting targets at 50 yards to cut drop in half. Searching for information on distances for load development has brought on a hailstorm of online debates and theories with 100 or 200 yards being touted the most informative.