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The speer # 10 used a ruger security six and the speer #13 used a S+W mdl 19. The only other loading book I have is the lyman 47 edition and it doesnt show winchester 296 powder. The strange part is the data between the books is so far off that i checked the data for 44 mag the diff is 2 tenths of a grain. Why is the 44 data close and the 357 so far off?. I was going to buy the hornaday loading manual but it only deals with hornaday ,products. useless to me . I figured 3 loading books would be enough information. I will say this, my lyman book seems to undercut my older speer #10 book with rifle loads .
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