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What Oscar says. That is the best source. There is also the websites of most of the powder and bullet manufacturers online. Quite a few of them have info online. Personally 6mmBR.com will get you in the right direction faster than any manual. Best powders by far seem to be Varget, 4895, VV135, VV140. RL15 is looking like it may be great for the heavy bullets. I have never been fond of Varget and there are so many who like it.