[Drew68]

Yes but those still require mechanical fitting pins to touch off the rounds.

No. These are electrically primed as well. An electric current makes contact with the primer to initiate it.

[TexasGator]

"However, unlike present-day artillery shells, railgun projectiles are just that – projectiles.

They contain no explosives, relying on the kinetic energy imparted by the projectile,"

This "rail gun projectile" contains explosives!