Quote:
all the brass i have is once fired .270 win mostly nickle plated winchester.
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STOP!!!
Nickel-plated brass won't work. You'll lose 95% or more of your cases, due to the plating being bonded to the nickel. When the plated cracks, it tears the brass, as well. Nickel plated brass is not an option for forming processes that require that much of a change.