My son chambered the round in his handi-rifle and he said it closed rough.
Hanidps are known for rough chambers. I have four of them, and while there is a lot to recommend them, they need a little tweaking for best operation. In the case of chambers, it's fairly easy to polish the chamber. My method involves an electric hand drill, a soft cotton mop, and some valve grinding compound. I put a little valve-grinding compound on the mop, chuck the mop in the drill, and run the mop into the chamber on a low speed. It doesn't take long at all, simply run the mop in and out the chamber several times and the chamber will polish nicely.
Handi's don't have a real strong ejection, being a spring-operated lever. It doesn't take much to stick a cartridge in the chamber. Polishing that chamber helps.