I think this topic may be of much wider interest than you realise as the availability of Lapua brass for the 6.5 Creedmoor makes this discussion of direct relevance as far as I can tell.
In my 9 months worth of experimentation with the Creedmoor I haven't seen any really obvious signs of pressure in my brass. Then I tried Re26... After a lot of research I decided to try up to a max of 48 grains behind the 143 ELD-X in Lapua brass/CCI450 primer. The top load had some extrusion of the primer in to the firing pin hole. This powder also shot poorly from my rifle so I gave it up totally. So my limited results backs @gimp's experience.
Anyone who has converted Palma brass to 7mm08, 260 or 243 might also want to chime in as well.
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