I was having trouble with cases locking up my Hornady case feeder. This was in 45 acp, 38 special, and not as much in 223/556. It was very annoying.
I tried a few fixes I found on the net. None were really satisfactory.
Tried to make a delrin insert between the hopper case and the shell plate. Too much trouble when the band saw blade broke.
I put a coil spring in the gap, just large enough to fill the first lace the cases hung up. The cases hung on the coils. Added heat shrink tubing, issue solved. Worked very well, but not perfect. Cases still rode up and got in the wider gap, binding up. Added another wider spring, with heat shrink tubing. Not perfect but much better. Just one hang up in 500 38 specials.
I drilled a hole for each end of the springs so the spring is humped up in the gap and used multiple layers of heat shrink to secure the spring in the hole.