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Old May 9, 2013, 03:41 AM   #3
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Join Date: February 9, 2006
Location: Homes in Brooklyn, NY and in Pennsylvania.
Posts: 4,906

With all due respect, the relationship between a bullet and the proper twist rate has little to do with bullet weight.
The Greenhill Formula for calculating twist rates does not require any weight input, though there is input for specific gravity. The necessaries are bullet length, bullet diameter, and velocity.
See this link:

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