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The only real mistake I have ever made while handloading is "mushing" or setting back the shoulders on some 300WM handloads. They were the first batch I reloaded entirely all by myself, and in my attempt to put a light crimp on the final product, I set the die too far down and was contacting the case-shoulders. It was only a slight deformation, but definitely noticeable. A few took quite a bit of persuasion to chamber into my Remington 700, but worked just fine otherwise! I have never had that issue again though!