I'd also like to see a comparison of bullets dropped onto the concrete floor before loading versus those that weren't dropped.
As I have aged and my hands have quit being anything close to dexterous, I drop single bullets onto the concrete floor of my loading area fairly regularly. I usually put a dot on the bullet with a sharpie once it is loaded, and so far I have never seen any effect on group size. I think that the inertia of a single bullet is insufficient to upset a jacketed bullet enough to matter.
Dropping a box of bullets on a concrete floor is supposedly a wholly different matter, but since I have yet to do that,
I am just repeating what I have heard.
