Wad in Browning BDX turkey extra distance

[Penguin907]

https://photos.app.goo.gl/ViXTsvh5NfP7iZcn8

Can someone explain how this was works? It grouped numbers 4s pretty well, but not sure how it doesn't turn into a slug since it has no slits that open to the top. If possible I'd be interested in doin something similar for hand loads.

[TrackeySauresRex]

I can't answer, that's for the sharpies. But if you can put up some patterns of them BDX loads I'd like to see em. TIA