I've seen this concept before. My buddy said the maker sites plans were NG so he started from scratch.

LSPCS = Large and Small Primer Case Sorter




Tall ones are small primer.

What's the purpose of the ridged tray on the left?

Artistic license by the designer.

I see how this works and I suppose it’s foolproof, but if you have to pick up the cases and insert them individually into the holes can’t you just look at the primer pockets? Or do you just scoop the tray through a bucket of cases?