http://www.federalpremium.com/ammuni...omponents.aspx
The Federal 215 is a magnum primer and those ending with "M" are Match quality. The load data you are looking at must be for large capacity case and slow burn rate powders. You might try to find data for some other powder. I know most of Accurate powders do not require a magnum powder except in the Weatherby .378 case sizes. You might try a faster powder load that does not require a magnum primer. You will get lower velocities but at least it will be a proven load. Otherwise try the load with regular large rifle primers and see at the range how it performs. A lighter thann max load of slow powder may be easier to ignite with regular primers than a stuffed to the gills load.