I haven’t loaded lead in the 9mm for a long time now. I don’t know if it still the case or not but bore diameters among the manufactures used to very a bit. This isn’t normally a problem with jacketed bullets could cause problems with lead. The only way to find out if you need to change to different diameter bullet or not is to slug your barrel and measuring what size it is.
What gun are you shooting it in? I have heard the Beretta can still be finicky. Are you shooting swaged bullets or cast?