That looks nice. But I think it would be too short. The thrower would tend to “dump” powder into that. The result would be a lot of spilled powder.
FWIW, I tried a measuring cup that was pretty close to that. The force of the powder dropping and the short sides meant powder bounced out of the cup every throw.
I see, can see that happening. Should probably work ok for trickler only setups, without a thrower.




















































