[Unclenick]

It really depends on the gun's chamber. I've run into a couple of folks with ARs that just would not feed reliably if an SB die was not used, but I haven't noticed the issue. Some of this is luck of the draw. RCBS told me in an email that they have a 0.002" tolerance on die dimensions, and it could be those folks just happened to get standard dies on the loose side. But I've never had a feed failure in my Garands or M1A using standard sizing dies.

The small base die does narrow the case more, so it is a positive for avoiding slamfires in floating firing pin gas guns. But that narrower sizing also works the brass more, so it's a negative for brass life, and, in some guns, it may be a precision negative by making bullet alignment with the throat less precise. It would have to be tested in your chamber to see about that one way or the other.

Incidentally, those separately resizing case bodies in a Redding Body Die followed by a Lee Collet Style sizing die for the neck can get the Redding dies in a small base configuration for 30-06 and 308W.