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As I understand it, it is partly to do with volume.
A 125gr bullet that is mostly lead with a very thin layer of copper plate will take up less "space" than a bullet with a thick layer of copper given that lead is denser than copper.
So, using the same charge and same AOL, there will be less empty case space in the cartridge with the plated bullet than the jacketed.
Another aspect is that, certainly in the case of my H&N plated bullets it seems that the slick polymer film over the bullet reduces in less friction in the forcing cone than the plated bullet meaning that there is less pressure build-up behind the bullet than in the jacketed bullet's case.
Disclaimer: I may be completely wrong... I am a reloading novice. Secondly, there are probably loads of other factors influencing this, assuming my first points are correct.
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