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Nickel plating on cartridge cases is purely cosmetic, mostly for show and to get higher prices. When police used to carry ammunition in belt loops, nickel plated cartridges kept the brass from turning green in the belt, keeping the shift sergeant happy and smiling. (And you wanted that sergeant to be happy and smiling, believe me!)
Today, that factor still is involved, but for civilians is not usually important.
FWIW, the plating does appear to weaken the brass; my own experience is that nickel plated cases have much shorter life than plain brass ones. (But that beady-eyed sergeant may still be around, so be careful!)
Jim
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