Are you getting leakage at the funnel, or powder bounce?
Somewhere over your reloading equipment you are building a static charge.
(or have not eliminated charge transfered from your jug)
Tiny little kernels when charged will repel each other, being light they will bounce.
A pan full, case full, if at a charge will jump around.
You can wipe anything you want, like the plastic insulating tube, funnel, loading block, but it's the powder that has developed a CHARGE, a like-repelling charge.
Somewhere over your reloading equipment you are building a static charge.
(or have not eliminated charge transfered from your jug)
Tiny little kernels when charged will repel each other, being light they will bounce.
A pan full, case full, if at a charge will jump around.
You can wipe anything you want, like the plastic insulating tube, funnel, loading block, but it's the powder that has developed a CHARGE, a like-repelling charge.