Stool,
To each our own.... if running Ladders at 100/200 works for you, more power to you !.!.!
At 100 the faster Mv impact some what lower, and are aggressively effected by the bullet epicyclic cycle and can still be in an aggressive state of pitching and yawing (especially long, boat-tail bullets).
At 200, depending on trajectory of the combo, the faster MV might impact low, in the middle, or high, and is the worse distance to ladder test in my opinion, due to ballistic arc.
At 300 and further, they begin to predominately stack up, slower's low to faster's high. The epicyclic motion is nil, and are easy to signify and plot vertical dispersion.
If using a chronograph with a good setup, with ability to very accurate velocity data, then it is possible to get a better perspective to a 100/200 ladder test from a velocity standpoint, but still very hard to plot true vertical dispersion, which is the basis to ladder testing, do to the lack of trajectory.
And yes, I am talking for any rifle, other then low velocity cartridges. I do a fair amount of custom load development each year (owner of "The Accuracy Shoppe") and cover a wide range of calibers and rifle types, and is where I conduct the bulk of my ladder testing each year.
Best of Luck
Donovan Moran
