You will hear many horror stories about the damage nickel cases will do to your dies. It is supposed to "flake-off" and scratch your dies. As the hardest nickel is softer than the hardened steel most good quality dies are made of I question that line of thought.
I have reloaded several hundred nickel plated cases over the years, some as many as dozen times, and never once had a problem. Your results may vary however LoL
edit note: BTW, The nickel plating will not cause more pressure than the identical load in standard brass cases.