Just my opinion here but I am at the point where I believe that barrel harmonics smooth out vertical dispersion in small differences (100 FPS or less) and that a consistent hold yields smaller ES's. My evidence for those statements comes from the prepped vs non prepped experiment.
Two things to note is the POI did not correlate with the FPS in that experiment and the best chrono numbers came with my jacket removed, 20 rounds fired from ammo loaded at the same time and just randomly pulled from the box. 10 were fired with jean jacket on and 10 with jacket off and a just a long sleeve T shirt. Radically different ES and SD
Now I will say this, the lowest ES/SD had the smallest vertical spread but a 47 FPS ES still had less than .5 MOA vertical at 300 yards
My Shot Marker target system was delivered yesterday so combined with my chrono I will be able to get a better idea of whether that theory is correct
Two things to note is the POI did not correlate with the FPS in that experiment and the best chrono numbers came with my jacket removed, 20 rounds fired from ammo loaded at the same time and just randomly pulled from the box. 10 were fired with jean jacket on and 10 with jacket off and a just a long sleeve T shirt. Radically different ES and SD
Now I will say this, the lowest ES/SD had the smallest vertical spread but a 47 FPS ES still had less than .5 MOA vertical at 300 yards
My Shot Marker target system was delivered yesterday so combined with my chrono I will be able to get a better idea of whether that theory is correct