Some brands of cases are manufactured with thinner walls than others, when you discover these just save them for later use .
I had the same experience when I started loading 9mm with .356 diameter bullets....a lot of them would loosen. Easy fix was bigger bullet .357 solved that problem completely. I started using cast lead , RN , TC and SWC all sized to .357 and I've had no more loose bullets ever ! The .357 size works in 4 different pistols , seating depth may need adjustment due to larger bullet but the SWC and TC design's were easy to get right for all 4 guns.
The cases with thinner walls have no trouble holding .357 bullets at all, use them here.
Gary