I think most of the people who get into trouble with this are handloaders. These are the believers in neck-sizing, as opposed to full-length sizing. Their rationale is, that sizing the neck only results in greater accuracy and longer case life. In theory, maybe. However, after firing an infinite number of tiny groups with full-length-sized cases, I don’t think there’s much difference, if any. As for case life, if you use good brass, and set up your dies properly, and your chamber is not oversized, you’re going to see hardly any difference, or no difference.