SEHunter, full length sizing cases and setting their shoulder back a bit ends up with a small spread in their head-to-shoulder dimension. If you try to set the die such that sized case headspace is the same as fired case headspace, some of the sized cases will be a bit longer. Those may start binding the bolt a bit when they're chambered. It all depends on how much lube's put on the case, what the lube's slipperyness is and how springy your reloading press is.
Sized cases with 2 to 3 thousandths clearance from bolt fact to shoulder's not a problem. If it's over 4 thousandths, then cases stretch too much and case head separation may start to happen after a few full length sizings of the same case.