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this is the funnel/expander on the left for pistol,and the funnel on the right is for rifle.I believe only the pistol calibers expand the case mouths. these go inside the 'die' that the powde measure clamps to.
I love my Dillon 650 I'd never change a thing well make it a little less powder picky..
All sized cases need to have the case ID expanded to just less than the bullet OD.
Not if you don't size them too small to begin with. The only reason there is an expander ball in a bottleneck sizing die is that there can be a large variation in neck wall thickness. The die squeezed in but a thick case can make the opening too small so the expander pushes it back out.
Some turn their necks to even thickness and then use a specifically sized bushing to make sure the case isn't oversized.
And then there is the Lee Collet die which sizes the neck onto a mandrel, assuring a set size of the neck opening without working the metal as much.