Considering wind shifts at 100 yards can be as much as a foot with some pellets, 4" is pretty decent (~1 MilDot), depending on the windspeed....Bob
There are of course these Labradar measurements from Yrrah:
Their BC will be superior to the 25.4 gr. Kings at virtually any velocity.... If you are shooting at 100 yards, I would suggest the optimum velocity for minimum wind drift will be about 850 fps, the same as any other Diabolo pellet.... However, the penalty in drift is miniscule at 900, or even 950 fps.... I would use anything between 850-950 providing you are not seeing spiraling at the longer ranges in your barrel.... Realistically, if your gun is too powerful for the 25.4 gr. Kings, then use the Heavies, providing they are accurate for you.... Bob