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Respectfully Don, I would disagree. Though copper [itself] is harder than the casting material of the typical hard cast bullet, the jacketed bullet is not all copper. The copper is simply a thin shell, supported primarily by the soft lead inside. If you are comparing solid copper bullets to hard cast, I would concur.
Yes, there are loading differences for lead, hard cast, and jacketed bullets, just as there are different loading instructions for solid copper bullets. The differences have to do with bearing surface, friction of the exterior material, as well as it's ability to compress.
But, that's simply been my experience picking up fired rounds from ranges.
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