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I only use Starline brass, and have found that their brass is usually a consistent uniform length. I do chamfer (deburr) both inside and outside when I load the brass for the first time. It's not necessary to do it with every reload.
Deburring on the outside will only ADD to feeding reliability. It in no way prevents headspacing. Make sure that when you deburr inside and out, that you only round off the sharp edges - you do not want to create a knife edge on the case mouth.
Deburring on the outside will only ADD to feeding reliability. It in no way prevents headspacing. Make sure that when you deburr inside and out, that you only round off the sharp edges - you do not want to create a knife edge on the case mouth.