I can understand the 308 and some others but when i purchased the Speer and the Nosler in 338 it was in there for 338 Win. Then if you cross referenced it in there manual itwas the most accurate powders tested. On another note why don't these manufactures list there load data on there web sites? I mean all to sell a book? The info theygot testing the bullets should be listed without purchasing it.Itkind of sounds like this: I just got a set of ultra high performance tires but they don'tperformlike they should because i didn't pay for manufactures tire pressure recommendations?