What color is your Dillon hopper? Mine is/was green and has been badly discolored (hard to see through) by powders (mostly Unique and Bullseye, never titegroup). I have looked for replacement hoppers and the pictures of the current ones seem to be clear (colorless), as opposed the the green one I have. It just may be, and I do not know for sure, that Dillon has changed the plastic composition that they use in the hoppers now. My Dillon hopper is about twenty years old or so.