Problem truing dope ELD-X

[Corndog]

Hi fellow shooters, first post.
I am having a big problem trying to true my dope to what I'm actually shooting.
300 Dakota 30" 10 twist
100yd zero shooting 500yd 3.7 slope
Hornady 212 Eld-X. 336 G7 BC
3110 fps Oehler 35p
Scope 1.75" above bore
52* 52% 27.35

If I use Hornady 4dof calculator I get 6.48 to 500yd, this what I am actually shooting to 500.
I Trasol,Shooter,Strelok and the calculator on Berger ' s website.
To get any one of those to 6.5 MOA I have to raise the BC to .460.
Is it normal to use that much chg to true your dope?

(Haven't been able to use the Hornady calculator for couple days )

 

[DocUSMCRetired]

What is the shooting direction?
What is your latitude?
What is the Station Pressure? Ours uses Station Pressure not Barometric Pressure.
What is your turret tracking coefficient?

Using: Latitude 32 Degrees, Firing Direction 90 Degrees (East). Your information, including pressure. Wind set to 0 mph (to remove any Aerodynamic Jump) I get a firing solution of about -6.74 MOA. That is not accounting for any turret tracking or anything else that might have occurred. Using the G7 BC of 0.324

 

[DocUSMCRetired]

Really we need 1000 yard dope, you should not be changing the BC at Super Sonic velocities. I would say run the BC that is 0.324 G7 then fine tune the other firing variables including turret tracking.

 

[Corndog]

Thanks for the response.
Lat is 36 shooting 180 due South
Station pressure is 27.35
Scope Leupold Mk4 8.5x25 .25 MOA per click.
Scope has always been spot on in the past,but I will check it again.

 

[Corndog]

Really we need 1000 yard dope, you should not be changing the BC at Super Sonic velocities. I would say run the BC that is 0.324 G7 then fine tune the other firing variables including turret tracking.

Should be able to test to 1100 in a couple weeks

 

[SheepDog]

Do you know what the air currents are between you and the target for each 25 yard metric?
Temperature? humidity?

There is no way (yes I said NO WAY) that ballistics software can give absolute results. The reason we shoot at different ranges under differing conditions is so we can estimate the bullets path. I have written three and a half ballistics programs (the half is the one I am writing now) and you can get close but there are too many real world variables that are unknown to deliver absolute results. Software can only approximate a path within the tolerances of real world inputs.

 

[eric32]

What do you mean by air currents?

The ballistic arc on a 308win 2700fps 175smk is about 16ft to get to 1000yards

With a tall enough wind flag i think its possible to know what the wind is doing at the peak of the arc

 

[SheepDog]

What do you mean by air currents?

The ballistic arc on a 308win 2700fps 175smk is about 16ft to get to 1000yards

With a tall enough wind flag i think its possible to know what the wind is doing at the peak of the arc

The air moves 6 different directions in three dimensions and it can be different many times over in 1000 yards. The air can be different temperatures and different densities over the 1000 yard range too. How can one expect software to predict the path of a bullet, reliably, when there are so many variables that are not dealt with? Software is a "best guess" and never a certainty.