Looking at tightening up my groups a little more. How big a deal is case and bullet run out? Obviously, if it is very pronounced, it becomes a huge problem. But how often is it a factor in everyday reloading? How many of you measure run out as part of your routine when reloading & case prep? What type/manufacturer of measuring device do you use? I'm looking at getting an RCBS Case Master, but not sure if it will be worth the cost just to satisfy my curiousity as to what, if any, run out is present in my reloads. All comments are welcome.