From Berrys bullets FAQ
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.
http://www.hodgdon.com/ has reduced loads using H4895 and trailboss. You can Google Universal Clays 30-30 loads but these are even lighter loads than using H4895 and some Trail boss loads. Bottom line, there are much better powder choices than Universal Clays for what you want to do. Save your Universal Clays for your pistols and shotguns.