Just a couple of observations I noticed by the experience:
1. Angle angle angle. The base angle needs to be experimented with....it's fairly steep, but obviously with the long .357 case and the thin plate, the .357's might topple.....but they didn't, even at that test speed.
2. The thin plates were actually the best part. Thicker plates could and would, for sure at that speed, catch cases. In fact as you had to notice, the measely short 9mm, during its demo run, did in fact catch a single case at that speed. Why the 9mm and not the .357? I decided to play it in Youtube in slow motion to see.....and was surprised again. In fact, the 9mm dropped several times base up! But none of them arrived below base up. Therefore their base weight had to have turned them in the funnel!! Amazing. Did not expect that. Yet the reason for that hang was still not obvious, but I doubt it would have happened at a slower speed.
If you use the adjustable slide at the front, just be sure to make it as wide as it allows......or print the non-adjustable fully open one, if TylerR has added it.