Make your own .380 and Makarov brass out of 9mm casings using a case trimmer? We all know the case dimensions are only 1mm apart from each other, .380 at 17, Mak at 18 and 9mm at 19mm's. Are the case bases different dimensions to the point that trimming a 9x19 case down to 17 or 18mm would be unworkable in a pistol chambered for those rounds? If it would work, with as much 9mm brass as I have, I could trim some cases and have a crap load of ammo worked up for .380 and Makarov with nothing invested except for a good case trimmer and a decent set of calipers. I figure the only stupid question is one that's not asked, so there it is... Anyone have an answer for me?