Allright, here's a short vid of it running as a repeater. It was still hanging up on feeding periodically, but maybe only 20% of the time. I now know this is because I had the cone angle wrong at the chamber end of the barrel . It was too shallow. (I measured two original barrels and used that average angle to re-cut my barrel bevel) I put it back in the lathe and re-belled it a little steeper and it now feed dummy rounds much more reliably.