I’ve gone in the other direction. I’ve begun experiencing with Starline’s 38 Shot Colt brass
The shorter cases eject better. I used to use .38 cases in a 357 revolver without limiting myself to the very low pressures of 38 special for this reason. Short Colt is even shorter, but you can also simply trim a 38 or 357 case to whatever length you desire.
Moon-clips can help with ejection as well, if they clear the grips properly. The clips are an all-or-none proposition. Either all the cases come out, with the inertia of the loosest cases aiding the ejection of the stickier cases, or the stickest case holds up the whole package and none eject. Speedloaders need more clearance to load than moon-clips, but the loose rounds coming out during ejection don't need as much clearance to drop as a full clip of empties. So either way, you need good clearance. If you cut a case, it's impossible to get the new clip in the cylinder with the cut piece stuck in one chamber. Once a speedloader looses its rounds, at least some of them will drop into the chambers that are clear. I don't concern myself with that too much. There are plenty of worse things that could conceivably happen.