Gallery

Art Merrill
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Speer’s Index Numbers: A 1950s Shot At Logical Wildcats
Whatever happened to Speer’s “Index Number” of the 1950s?

Art Merrill
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First Load Data
Although Speer’s own load data of the day suggested several powders that fell outside Index Number parameters ...

Art Merrill
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Second Chart
… Wildcat Rifle Loads implies IMR 4064 should be the powder of choice with the 150-grain bullet in the .308 Winchester.