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Lead has less friction than copper so takes more powder than it's jacketed counterpart to get it up to speed. More friction from the copper means it sits still in the case longer, raising pressures more before it starts moving. Copper takes less powder than lead for equivalent speeds.
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I like that explanation a lot. In a sense, the extra friction from a copper-jacketed bullet mimics the effects of a heavier bullet (more resistance to being propelled forward).