Think of it instead as: The ship can fire 10x as many rounds before needing to resupply as it can with today's technology. The resupply also happens to involv

Think of it instead as: The ship can fire 10x as many rounds before needing to resupply as it can with today's technology. The resupply also happens to involve replacing the barrel. Today's 5" guns have to have their barrel replaced every ~7000 rounds anyway (source: http://www.navweaps.com/Weapons/WNUS_5-62_mk45.htm http://www.navweaps.com/Weapons/WNUS_5-62_mk45.htm ).