If you have the two piece shells, start by removing the primer. Then cut a 45 degree notch just at the edge of the outer brass with a machinist's saw. A little piece of the brass will pop up when you cut through the outer brass before the saw hits the inner brass. Grab the little piece with a needle nose pliers and roll the brass until you remove the whole thing. The primer hole will now accept a 209 primer. I don't remember whether new Remington hulls can be peeled like this. The last ones I did were WW paper. I hear most people use a sizer these days.
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