For a prepper on a limited budget the 38spl 158 grain swc is a good way to increase your ammo stocks. Since you reload you have the ability to further reduce your cost by reducing the quantity of cases you maintain.
Having said that, I would also stock a quantity of top of the line ammo for actual defense in the early stages of a break down.
As the discussion has said: The SWCs are excellent small to medium game loads. For defense there may be a better defense load available.
If you would like to discus this further, please PM me.