As far as the charge goes, I've heard people saying that plated bullets are loaded to lead specs and also that they are loaded to the low end of jacketed levels. I load lead 125gr at 3.5gr and jacketed 124gr at 4.3gr, so that's a pretty big difference.
Just a friendly suggestion when it comes to reloading.....get the info directly from the source rather than "heard people saying". That way, you know what the facts are and not some 2nd hand info. Besides that, when it is available online, there really is no excuse for not using the resource.
From Berry's web site
FAQ: How do I load Berry's Preferred Plated Bullets?
Plated bullets occupy a position between cast bullets and jacketed bullets. They are soft lead, but have a hard outer shell on them. When loading plated bullets we have found best results using low- to mid-range jacketed data in the load manual. You must use data for a bullet that has the same weight and profile as the one you are loading. Do not exceed mid-range loads. Do not use magnum loads.