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About 15 years ago, Varmint Hunter magazine published a interesting table showing how many rpms a bullet was traveling in relationship to bullet weight and twist rate. If you have that table, please post up. It's this explosiveness I believes that makes the 'fur fly. Thanks, r in s.
 
Posts: 866 | Location: Puget Sound country | Registered: 18 January 2005Reply With Quote
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I am no "Pro". And I don't have the article you are asking for. But,the formula to determine RPM from velocity and twist rate is as follows.

MV x (12/twist rate) x 60 = RPM

A quicker formula is,

MV x 720/twist rate = RPM

Note! There is no consideration as to bullet weight. Or even that the object is even a "bullet".

muck
 
Posts: 1052 | Location: Southern OHIO USA | Registered: 17 November 2001Reply With Quote
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muck's formula can be used in Excel allowing you to enter any combination of twist and velocity
to calculate RPM with no table required.
 
Posts: 13978 | Location: http://www.tarawaontheweb.org/tarawa2.jpg | Registered: 03 December 2008Reply With Quote
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I think I remember reading somewhere that RPM"s contributed very little to the "explosion" factor. Anybody know for sure?
 
Posts: 8169 | Location: humboldt | Registered: 10 April 2002Reply With Quote
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A gent in Ohio made a table for me, exactly what I was looking for....thanks everyone.
 
Posts: 866 | Location: Puget Sound country | Registered: 18 January 2005Reply With Quote
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