This is probably too basic a question, but if someone would like to explain this, I'd be grateful. Back in the day when I began precision shooting, the standard resizing procedure was too neck-only resize with a bushing. I've used many L.E. Wilson dies to do this. The theory was that you were keeping the body of the case close to the chamber dimensions--not unnecessarily reducing it--while getting the neck diameter where you want it. I haven't kept up with the new thinking in this area and have only returned to precision centerfire shooting in the last several years, but it now seems that the favored approach is to full-length resize with a bushing (although some don't use the bushing). I don't really understand the advantages of doing this over simply neck-sizing. If I'm visualizing this correctly, this process would first expand the neck with the button while sizing down the body of the case. The case neck would then be reduced by the bushing. Then on removing the case from the die, wouldn't the neck be expanded again as it passed through the button? I guess I'm missing something here because this seems like a real re-working of the neck brass, with the bushing not really accomplishing its mission. Obviously, I've got this wrong. Can someone straighten me out? And what are the advantages of the full-length sizing of the case body over simply neck-sizing (as long as the rounds are going back into the same rifle each time)? Thanks in advance for your insights!