I load only Nickel plated brass and have been doing so since 1999.
This winter I have loaded over 2500 rounds of nickel plated ammo and have not had any issues with any of my RCBS dies. Like others have said I do keep my dies and brass clean and well lubed. If there is a flaw in the brass it gets chucked before I ruin anything.
Some people ask me why I use nickel plated brass. My main reason is that I Iike how it does not tarnish like brass does. Oh yeah I like shiny things too.