Model 41 ejection problem
Perhaps this will seem too simple, but in shooting a number of Model 41s over the years, failures to eject have happened to me as well. On one occasion, shooting Eley ammunition did exactly what you describe -- with some regularity. I attributed this to brass that was too soft, because the same ammo stuck in the chambers of my model 63. This was really just a guess, but I save the Eley for my rifles and use CCI in the 41s.
The other times this has happened to me, I was able to resolve the problem my cleaning the chamber of the gun thoroughly. I had the problem years ago, particularly with the Federal ammo I was shooting at the time, and believed -- again just a guess -- that the very hard, almost plastic like lube was causing residue and friction in the chamber, particularly near the case mouth area.
In any event, cleaning the chamber well did cure the problem. I also found that if I rolled the ammo on a cloth with a little BreakFree, the problem stopped.
The gun I shoot most often dates to 1971. The problems I mentioned above were with that same model 41. Now shooting CCI -- std velocity, Green Tag and Pistol Match, it runs quite well.
Hope this is useful.
Jeff