Trying to put a picture on what the last four guys have told you, their thoughts were mine as well.
Red circle is how the stem holding the bushing down is set to resize the most amount of the neck possible while leaving enough room for the bushing to rattle when shaken. The orange circle has the stem screwed out basically as far as possible to exaggerate the difference and show the range of adjustment on the bushing. I do vary the length of the neck resized sometimes, this particular 6.5CM die on the left is set up to resize for a rifle I run from a mag so I resize a lot of the neck relatively tightly. You can experiment with how much of the neck you do resize, partially sizing the neck is one way to further reduce interference fit below what a -.001" bushing offers.
Red circle has no decapping stem installed, the die works either way.
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