After 30 years reloading its obvious to me nickel cases are less durable than brass. I assume the brass is thinner so it can be nickled. The case necks usually split after just a few reloads. Even with light 38 target loads. That being the case why do manufacturers use nickel cased ammo for personal defense rounds almost across the board. I think originally nickled cases came into being for the corrosion resistance for ammo carried in belt loops to stay clean and shinny looking. I wonder if its used now to signify Defense Round.