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So the 45-70 is closer to loading long revolver rounds than bottle neck rifle. When you size a straight walled case you then use the expander to expand "JUST" the mouth and a slight bit of the neck. Usually you will also give the lip of the case just enough flare to allow a bullet to sit atop before seating anc crimping. This step is even more important when using cast bullets. A failure to give enough of a flare can result in shaved lead, shaved powder coat, and also crushed cases from sticking or unsquarely seated bullets.
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LAter,
Mike / TX
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