The Norincos are about as close to the original GI guns as you can get, and the GI guns were made to feed ball ammo. If they or the Norincos feed ammo with other bullet shapes without being worked on, fine and good, but there is no guarantee they will.
Even with guns that are made to feed a variety of ammo, we have to assume that someone will soon come along with a weird bullet shape they won't handle.
Jim