I'm not as optimistic as Tim. They work "much better" now. My fondness is for rimmed calibers in Hand Is. Just seems a better fit fit. The ejector guns of a yesteryear had many problems with stuck cases. Fixes ranged from tuning the ejector, as Tim already mentioned. (Covered in our FAQ's) To polishing the chamber. IMHO the crux of the issue is the higher pressures associated with the rimless calibers. Not that the handi is not strong enough, it is, but its not the most finely manufactured forearm out there. IMHO, there is allot of "movement" in its action upon firing these higher intensity chamberings. The forward "hinge" makes for some action "spring". The net result is stuck cases. Don't get me wrong, I love them and own quite a few of them myself. But I'm aware of there limitations and accept the challenges associated with them. The conversion to extractor was a very good step in removing allot of the ejection problems in handi's chambered for rimless calibers. Again, IMHO 40 - 45K is the pressure range handi's should be held to.
BUT, just so you don't think me a hypocrite, I also have a number of handi's in rimless calibers that never have given he a hint of a problem. I have had a couple others that needed some "help".
CW