This funnel is sized to perfectly slip into the top of a Hornady powder throw tube. Reduce gunpowder spills (always good), even when you're in a big hurry or being unusually clumsy!
There's another nice one already on Thingiverse, but mine is simpler, faster to print, uses less plastic, and does the same job just fine. :-)
The angle of the cone prints perfectly on my MakerGear M2 without any supports. I slow down my base print speed a bit to make sure I get a very smooth interior. So far I've only printed this with ordinary/typical PLA and it's been fine.