I believe both oppinions are accurate and I was thinking pistol brass in my earlier post which I will size when new for the stated reason. In the case of rifle brass, the first loading is FL sized to factory spec for multiple rifle use, and after it has become fireformed to the specific chamber using a start charge, I switch to FL resizing for the individual rifle chamber for subsequent loads in hunting rifles. I started this with the advice of the late Bob Milek, but if you shoot benchrest and prefer to neck size only, I can't argue with that. FL resizing is beneficial where fast loading and extraction might be necessary.
