January 7, 2009, 05:49 PM | #1 |
Senior Member
Join Date: December 9, 2008
Posts: 136
|
BC Question
When discussing ballistics coefficient, what is the difference between G1, G2, G3, GL, G 'whatever', etc. etc. etc. ???
|
January 11, 2009, 11:55 PM | #2 |
Senior Member
Join Date: October 19, 2007
Location: Fort Bragg, CA
Posts: 679
|
I have no idea what the G# you are referring to is. Ballistic coefficient is usually referred to as a decimal such as .304 or .540 with .540 being more aerodynamic.
__________________
You only truly believe in freedom if you believe in the freedom of those you disagree. |
January 12, 2009, 12:44 AM | #3 | |
Senior Member
Join Date: October 14, 2008
Posts: 1,125
|
Quote:
I believe that G refers to the shear modulus. Give us some more information and we may be able to help a little more. J. |
|
January 12, 2009, 01:49 AM | #4 |
Senior Member
Join Date: February 13, 2006
Location: Washington state
Posts: 15,248
|
G1, G2, etc has to do with the bullet profile or form function. All BCs are a comparison to a "standard bullet" or "ideal bullet" with a drag coefficient of .59xxxxxxxx, so any bullet with a BC lower than 1 has a higher drag, BC higher than 1 has less drag. Read this.
__________________
Never try to educate someone who resists knowledge at all costs. But what do I know? Summit Arms Services |
January 12, 2009, 09:22 AM | #5 |
Senior Member
Join Date: March 24, 2008
Location: SE Oklahoma
Posts: 491
|
The G1, G7, etc. for ballistic coefficient numbers has to do with the drag function, e.g., the amount of drag the bullet has. A sharper bullet has less drag than a round nose bullet (and there are other characteristics as well). If I understand it properly, there are basically 2 major ballistic tables: the G1 (for the majority of commercially available bullets) and G7 (for strictly military bullets.) So, when you go to Nosler's web site and look up a ballistic coefficient for a bullet, that will come from a G1 BC table.
For more info see: http://www.exteriorballistics.com/eb...oefficient.pdf
__________________
ryalred rifle & muzzleloader -- exhilarating bowhunting -- obsession reloading -- addicted |
Tags |
ballistics , bullet , coefficient , trajectory |
|
|