What is DRAG FUNCTION and how is it determined

[hiperflyer2]

Hello Folks, my name is Mike C. And I’m new to this forum.
my first question may be stupid but here goes.
under the menu Profiles/Zero there is a setting for Drag Function and mine was/is set to G1.  Can anyone describe what this setting is and how to determine the correct sting for my rifles?

thanks and Happy Hunting.
Mike C.

[ironman]

DRAG COEFFICIENTS ARE FOR THE BULLETS...A LOT OF BULLETS HAVE THE CAME DRAG...USUALLY G1 OR G2...DETERMINED BY THE MANUFACTURER...ANY RELOADING MANUAL SHOULD HAVE THE DRAG FOR RELOADING...THESE DRAG COEFFICIENTS ARE PROGRAMED INTO THE SCOPE FOR EACH ROUND YOU WANT..

[odin]

Drag coheficient

Check this out  - here in all its radiant glory.
In short the G1 & G2 relate to bullet shape.
Essentially once your bullet data is in your scope and you are zeroed, you can then input range/wind. Scope measures altitude and air density/barometric pressure and then calculates an adjusted aiming point for you.
Dont really use it for the bulk of the hunting that i do as it is stalking and snap shooting, so I set the range to average shot length and do a manual adjusted aim point on the fly.
However for static hide shooting or long range open country this is a very useful feature.
Codes are:
G1 – also known as Ingalls, G1 projectiles are flatbase bullets with 2 caliber nose ogive and are the most common type of bullet.

G2 – bullets in the G2 range are Aberdeen J projectiles

G5 – G5 bullets are short 7.5 degree boat-tails, with 6.19 caliber long tangent ogive

G6 – G6 are flatbase bullets with a 6 cailber secant ogive

G7 – Bullets with the G7 BC are long 7.5 degree boat-tails, with 10 caliber tangent ogive, and are very popular with manufacturers for extremely low-drag bullets.

G8 – G8s are flatbase with a 10 caliber secant ogive

GL – GL projectiles are blunt lead nose

[jimalee]

Feb 6, 2018 22:10:36 GMT -8 odin said:

Drag coheficient

Check this out  - here in all its radiant glory.
In short the G1 & G2 relate to bullet shape.
Essentially once your bullet data is in your scope and you are zeroed, you can then input range/wind. Scope measures altitude and air density/barometric pressure and then calculates an adjusted aiming point for you.
Dont really use it for the bulk of the hunting that i do as it is stalking and snap shooting, so I set the range to average shot length and do a manual adjusted aim point on the fly.
However for static hide shooting or long range open country this is a very useful feature.
Codes are:
G1 – also known as Ingalls, G1 projectiles are flatbase bullets with 2 caliber nose ogive and are the most common type of bullet.

G2 – bullets in the G2 range are Aberdeen J projectiles

G5 – G5 bullets are short 7.5 degree boat-tails, with 6.19 caliber long tangent ogive

G6 – G6 are flatbase bullets with a 6 cailber secant ogive

G7 – Bullets with the G7 BC are long 7.5 degree boat-tails, with 10 caliber tangent ogive, and are very popular with manufacturers for extremely low-drag bullets.

G8 – G8s are flatbase with a 10 caliber secant ogive

GL – GL projectiles are blunt lead nose

[mexicanjoe]

G1 is supposed to be for round nosed bullets while G7 is for longer pointed bullets. Theses are the most common G found.
The issue is that some manufacturers have not moved over to the G7 data for that style bullet and still use the G1 data.

So G1 will be most commonly used across the board.
Both work you just have to input the data.

Drag= any force that hinders bullet flight. Weight, shape, wind, pressure, humidity and a few others.
The BC lists are a way to put a Gx value to that drag.

To better understand it get these books. They are a real easy read and very informative. I read 2-4 within 2 weeks.

[mexicanjoe]

www.amazon.com/Precision-Long-Range-Shooting-Hunting/dp/1719550964/ref=asc_df_1719550964/?tag=hyprod-20&linkCode=df0&hvadid=312149988622&hvpos=1o1&hvnetw=g&hvrand=14570229643313847568&hvpone=&hvptwo=&hvqmt=&hvdev=t&hvdvcmdl=&hvlocint=&hvlocphy=9027104&hvtargid=pla-569348561881&psc=1

Sorry wouldn’t load a picture.

[mexicanjoe]

There are also Long Range Shooting pages on FB and other places that can help you with some of the more advanced aspects of shooting.