Yes they can be reloaded ok but they CAN damage the internal surface of the die. In my opinion with the low cost of brass these days dont touch them, its cheaper to buy premium Lapua cases than to keep replacing your set of dies especially if you have good dies.
I dont think £70 for 100 cases that will probably see 10 loadings so 1000 rounds is a lot of money? One Red deer and they are paid for. For the past three years i have been using Redding Competition dies (now i am using factory loads) and i would not let them see a nickel plated case, why do you think there is more force needed to resize? Its because the plating makes them harder, they are noticably harder to trim, harder surface = more chance of damaging the components used to reload them.
RPA6mmBr
Bully for you, as I said. If you have expensive kit then this is something to fret over, which is understandable.
'Harder' in this context may just mean that there's a different degree of friction between moving surfaces.
There's no definitive answer to the dangers (or not) of nickel plated brass, but I did find this.
Stainless steel is a steel-chromium alloy that is more resistant to corrosion than carbon-steel or other steel alloys. As with all steel, it strength depends on its grade; but overall the strength difference between carbon steel and stainless steel is negligible
Read more: http://wiki.answers.com/Q/Is_stainless_steel_harder_than_steel#ixzz1mwxGWDG5aere's