Sure, you can. But you shouldn't.
Jamming dry brass into a polished steel hole is certain to produce brass galling onto the steel. Microscopic bits of brass will be as firmly attached as if it were welded and the bits grow over time and the case necks will soon begin to look like the sizer is scratched; that's not good. A tad of case lube on the necks will prevent galling and lubing is much less a PITA than removing galling from sizer dies.