BC Question

bryceh12321 · January 7, 2009, 05:49 PM

When discussing ballistics coefficient, what is the difference between G1, G2, G3, GL, G 'whatever', etc. etc. etc. ???

totalloser · January 11, 2009, 11:55 PM

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.

j.chappell · January 12, 2009, 12:44 AM

Quote:

When discussing ballistics coefficient, what is the difference between G1, G2, G3, GL, G 'whatever', etc. etc. etc. ???

Can you give us an example? In what context have you read this or heard it discussed?

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.

Scorch · January 12, 2009, 01:49 AM

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.

ryalred · January 12, 2009, 09:22 AM

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

January 7, 2009, 05:49 PM	#1
bryceh12321 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
totalloser 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, 01:49 AM	#4
Scorch 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
ryalred 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