Deeper & deeper
Are pellets not both drag stabilised or spin stabilised then ?
Still doesn't explain why the Magnus Effect has an opposite effect on Diablo pellets.
Possibly because diablo pellets are both drag stabilised & spin stabilised is the reason the Magnus Effect rarely affects them and when it does it affects them the opposite way.
I think what is needed is some experiments in some sort of wind tunnel,
so the wind can be eliminated as an unknown variable.
With the rifle action in a test bed to eliminate operator error.
This is probably getting a bit OTT though.
Still it would be interesting.