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Encore50 told me a year or so ago that when sizing any jacketed bullet you need to run them through your sizer a couple or three times and use them shortly there after. Having a bit of metalurgical experience I can see where this is true. All metals have elasticity - some more than others. Copper will spring back a bit when run through a sizer but the good part of this is that copper also work hardens quickly. (ever take a piece of copper tubing and bend it a couple times? It breaks.) Now I realize that the copper used in bullets is annealed and probably alloyed a little to make it more ductile. But running one through a sizing die a couple times will reduce the spring back effect.