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Old August 6, 2012, 02:36 PM   #2
azar92
Senior Member
 
Join Date: April 16, 2009
Location: Utah
Posts: 187
It's refering to aerodynamic drag models based on particular “standard projectile” shapes. While some manufacturers will list a B.C. using a different model (G7, for example) most list the G1 B.C.

If you don't know, just use G1.
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