If you think the .25ACP is a pain you should consider what they made before deciding on the .25. They were taking .22 Hornet cases then cutting them off and making a very special piece of brass that did not fit anything else. Going to the .25ACP was a godsend considering all the work to make the .22 Hornet thing work. Hornet brass is not easy to find either. Once you have the reloading pieces the .25 brass lasts a long time. I was already set up to reload .25ACP (I really do not know what possessed me to do that) but I was all set when the conversion happened. .380 or 9mm is a little too large to function well as the extra volume in the brass would likely affect how the flame propagation developed (not sure that is a problem but I expect it is).