That's interesting. The holes are so small you wouldn't think that it would make any difference. Every day is a school day.Clearly Dynamite make some of their own pellets e.g. Robin Red pellets? Some of their pellets however, appear to be standard coarse fish pellets, which are then sprayed with colours and flavour?
I‘d wager that most if not all marine/trout type pellets are procured from the aquaculture industry and repackaged, or at least that used to be the case?
And re drilled pellets, that’s done so that farmed fish digest and break them down more quickly. It’s nothing to do with ease of hair rigging.