Contents - Index


Bullet Drag Tables


You can select the appropriate drag table for the bullet you are shooting or convert a BC (ballistic coefficient) to a different drag table.

About The Shoot! Ammo/Bullet Database

99% of bullets listed in the Shoot! Ammo/Bullet database have a G1 ballistic coefficient (as provided by the manufacturer) so the G1 drag table is selected as default.

The other 1% belong to manufacturers like Berger with their Very Low Drag (VLD) bullet designs. Whenever you see "(Use G7 Drag Table)" in the bullet style for a Berger bullet, use the G7 drag table since it is a G7 ballistic coefficient (no need to convert).


What Style/Type Of Bullet Does Each Drag Table Represent?

G1 - Default Drag Table (most Sporting bullets as explained above)
G2 - Conical Boat-tail style bullet.
G5 - Short to moderate Boat-tails (7° 30' Tail Taper) and a 6.19 caliber tangent nose ogive (e.g. Sierra Match Kings)
G6 - Flat based bullets with Spire Point Style Nose (6.09 caliber secant nose ogive)
G7 - ULD (Ultra Low Drag) and VLD (Very Low Drag) with a long Boat-tail taper and 10 caliber tangent nose ogive (e.g. Berger, Lapua)
G8 - Flat based Standard Shaped Hunting Bullets and short range bench rest bullets


Converting Ballistic Coefficients

When using a different drag table, always convert the existing G1 ballistic coefficient to the selected drag table, or vice-versa.

For example, lets say you selected a G1 BC of 0.314 and wanted to use the G7 drag table for this bullet. IMPORTANT - Note: Don't use a G1 BC in any other drag table without first converting it, or use a G7 BC in any other drag table without first converting, etc - you'll get incorrect ballistic results.

Here is how you do it:

1. Click the LOAD button, then either add or edit the load you want to convert the BC
2. At the top of the Load window, you'll see 3 buttons. The second one is the 'Convert Ballistic Coefficient'
2. Enter the velocity for this bullet (if not provided) - in our example 2920fps
3. Enter the BC and the drag table for this particular BC - in our case its a G1 BC of 0.314
4. Now choose the drag table you want to convert this bullet's BC to - in our example G7
5. Click Convert BC

You'll see the converted G1 BC to a G7 BC is 0.156