Gentleman, just set up my Mec sizemaster. A bit trying, bought it off gunbroker and the powder check mechanism had bent during transit. I could not figure out why the powder bar sliding interfered with other linkage below it. A call to Mec rep. and he was the one that said it must be bent. Got it back in shape and all is well. Question I have is some rounds come out perfect and others have a swirl. My guess is that even though the hulls are all the same brand they very in length slightly, should I just accept it as part of the process? Made 200 rounds so far and shot my first box today. Starting too like the sizemaster more as I go. Appreciate the sticky by Curly with lots of useful info.