I have 4 MEC 600 jr.s for 12, 16, 20 and .410s. They all work fine. But being a skeet shooter, 80% of my shot shell reloading is done on a 12 ga. PW. The 12 MEC is used only for "specialty" reloads like slug loads of which I shoot very few. The 16 is used for hunting so I don't load a lot of them either. The .410 does go out for skeet every now and then, but again, I'm not busting a lot of caps shooting that either. The 20 does shoot a fair amount of skeet, but I find it hard to justify retiring a machine that I've used for literally 50 years and which has required only 1 replacement part, other than wad fingers in all that time. But I'm retired so a little extra time reloading 20s really doesn't make a he double hockey sticks of a lot of difference to me. BTW I also make my own shot; 9, 7.5 and 6. I've got the time and I enjoy the hobby, so what does speed matter to me?