MOA Adjustment

[Clem Bronkoski]

This doesn't sound right to me. I'm limited to my long range shooting areas and my current range only goes to 300 yds. I've shot at 100, 200 and 300 yds and confirmed my zero and MOA correction. Now I was playing with the Hornady Ballistic Calculator and my correction and the calculator's results were spot on at 300 yds (4.7 MOA). What doesn't sound right is that when I introduce a 10 MPH 90* wind my MOA correction drops to 3.9! This correction changes as the angle of the wind changes. Should I be using that wind correction or just go my my actual results with zero wind?

 

[Barbourcreek]

Areodyjump cross winds yes

 

[MuzzleBreak]

On Ballistics AE my dope for 400 yards is 4.9. On Hornandys app it's 5.7. Can't figure that one out.
I verified my 400 yard dope and it's dead on at 5.

 

[Culpeper]

Your calculating and truing down to tenths of MOA?

 

[jebel]

Yes, that sounds right. You must have also input that your rifle has a right hand twist. Try putting the 10 mph wind in from the opposite direction (270 degrees). The elevation correction will go the opposite direction - probably over 5 MOA in your case. You can find charts and explanations for this effect - one example below.

Wind Vector Effect

 

[Barbourcreek]

Do your self a favor down load my app Eagle ballistics and make your life simple

 

[Culpeper]

Do your elf a favor down load my app Eagle ballistics and make your life simple

When will it be available for Android?

 

[Barbourcreek]

When will it be available for Android?

Still waiting for the conversion gentleman to finish apparently android has a hard time with ballistic apps that do this much

 

[Brathany]

I gave up on 4DOF. AB and even the non 4DOF version of Hornady app brings my bullets to home just great.

I need to look at that Eagle app.

 

[Clem Bronkoski]

OK I get it now but I can't find which direction my rifle twist on line. I found out that looking at the twist from the breech, if it turns clockwise it is a RH twist. I never realized that twist direction could have that much of an effect on trajectory in the wind.
BTW thanks for the responses. I guess you can teach an old dog new tricks!

 

[Clem Bronkoski]

Still waiting for the conversion gentleman to finish apparently android has a hard time with ballistic apps that do this much

I don't have an apple or ipad, only android or pc so I guess I'm SOL!

 

[Longtine88]

I don't have an apple or ipad, only android or pc so I guess I'm SOL!

I would trash my android and buy an apple just to ge the Eagle Ballistics app. It's that good!

 

[Clem Bronkoski]

Yes, that sounds right. You must have also input that your rifle has a right hand twist. Try putting the 10 mph wind in from the opposite direction (270 degrees). The elevation correction will go the opposite direction - probably over 5 MOA in your case. You can find charts and explanations for this effect - one example below.

View attachment 621890

Wind Vector Effect

So let's see if I understand this. If I have a RH twist like above and the wind is blowing right to left I would dial less MOA adjustment and that adjustment is determined by the actual force AND direction.

 

[Barbourcreek]

You can see in Eagle Ballistics app look at the elevation with the U next to it as the wind changes the aerodynamic jump changes your elevation dial Ups