@NotMeNotYou: One of the biggest and most underrated advantages is the fact that you would have nonexplosive ammunition. While the weapon would still overheat, overheating wouldn't lead to cooking off, and for AFVs/ships, no risk of powder explosions.

@Fenrick: just to add to this it means more than not having a vulnerability. Ships need to have so many space-consuming redundancies to prevent powder explosions. The Navy has the right idea pursuing this.