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Alf, I've contacted Accurate for data regarding xmp-5744 which is designed for use with cast bullets in large cases. They forwarded data to me via email for 375 H&H before it made it to their give away reloader guide. They have also data on similar cases like 416 Rigby. Given that this is a powder which is designed for use in reduced loads, you may be able to find a 'comparable' load in their manual, reduce and test. I think they also publish their load data on the net. Don't have the web page, but some of the index gun sites will. Hope this helps. Bob

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