In any case, it's not the Shells/projectiles that explode with the magazine, but the propellent. In the case of Aroura, that would be the missiles fuel, which lets be real, it's easy to get missiles to 30,000 km/s, which is 10%C. If they have enough propellent to do that, they more then have enough propellent to vaporize the ship carrying them with out the nukes going off.