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Message to Shawn Carlock from DUH

 
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  #8  
Old 01-19-2008, 06:19 PM
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Join Date: Jun 2007
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DUH,

Two things to look at:
1. Even though you are shooting level are there any ridges, slopes or draws between you and the target? If there are with a head wind these terrain features can cause a lift and make you shoot "flatter". If not then look at # 2.
2. Take your Kestrel out and page to BAR Pressure, on most modles hold both buttons down and it will switch to a screen with elevation this is the elevation the pressure is referenced to, make sure it is at "0". Now your Kestrel thinks it is at sea level no matter what and gives you "raw" or station pressure. Enter this into your Kestrel in the pressure at altitude box and uncheck "calc std pressure" box. This should enter the correct pressure into Exbal.

Also just in case check the basics:
Check 100 yard zero.
Check that click values are .25 moa.
Check every single box in Exbal to ensure all data is correct.

Hope this helps.
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  #9  
Old 01-20-2008, 03:10 AM
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Join Date: Feb 2005
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Posts: 2,781
DUH,

Your problem is not a problem, you'll figure it out! Definately an awesome rifle though the shooter has his part on a group like that.
Great shooting and congratulations on your rifle.;)
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  #10  
Old 01-20-2008, 04:24 AM
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Join Date: May 2007
Location: VICTORIA AUSTRALIA
Posts: 912
Quote:
Originally Posted by Shawn Carlock View Post
DUH,

Two things to look at:
1. Even though you are shooting level are there any ridges, slopes or draws between you and the target? If there are with a head wind these terrain features can cause a lift and make you shoot "flatter". If not then look at # 2.
2. Take your Kestrel out and page to BAR Pressure, on most modles hold both buttons down and it will switch to a screen with elevation this is the elevation the pressure is referenced to, make sure it is at "0". Now your Kestrel thinks it is at sea level no matter what and gives you "raw" or station pressure. Enter this into your Kestrel in the pressure at altitude box and uncheck "calc std pressure" box. This should enter the correct pressure into Exbal.

Also just in case check the basics:
Check 100 yard zero.
Check that click values are .25 moa.
Check every single box in Exbal to ensure all data is correct.

Hope this helps.
Shawn,

Yes I am shooting accross a draw that drops around 200 ft then rise to the target at about the same height as I shoot from. The heads of the trees in the draw I shoot accross are at around the 750 m mark. The breeze was good and steady hitting me on the nose straight on.

I checked the kestrel and pressed the sequence of buttons and it showed zero with a blinking (ref ) , I quess that stands for reference. Tonite I get sittng at home 29.77 inHg ? My alt at my house is 140 ft currently.

I checked the conditions from the previous shoot. I was firing from a different position at the same gong, but the distance was 700M. Guess what ? The wind was also solid 4-5 mph from 12 oclock. The shot travels over the same draw. Exbal came back with 16. 5 moa up. I ended up shooting 14 moa up in real bad mirage and landed the 3 shot cluster about 4 " dead centre high of the black circle. This really suggests that the shots travelling over the draw in a head wind most likely are getting around 2 moa lift ? Does that seem logical ?

I also had a 415 gong out that day and shot across the same draw. exbal gave 7.5 up in the mirage. I ended up shooting 6.5 up and still was 10.5 " high of centre. Maybe a combination of mirage and lift ?

The same day I fired at a 340 m target that is .99 cosine down hill with no draw to cross. Hit dead centre ?

Maybe I should try and set up a long flat shot at 1000 and take the draw out of the equation to see if the pda agrees with the strikes. I would have thought that should conclusively tell me if the draw I'm firing across is causing the lift ?

Shawn,

What figure do you use in the scope height above bore. I put in 1.5 " ?? BC is .768

Eaglet,

It sure makes you strut around a little when you hit your first 1000 + target in the lungs.

Cheers

DUH
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Last edited by Down Under Hunter; 01-20-2008 at 04:32 AM.
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  #11  
Old 01-20-2008, 04:29 AM
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Join Date: May 2007
Location: VICTORIA AUSTRALIA
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Quote:
Originally Posted by dogdinger View Post
that is impressive.....cancel that offer to take you elk hunting......all we would be doin is packin your meat!!!!keep us posted when you stretch that to 1500......AJ
AJ,

I sure feel confident right now about drilling a big old six point that walked out of the timber in front of me. I will post a 1500 yard target as soon as I find a suitable place to test at that range.

Around my area, its harder than it sounds.

Cheers AJ..
DUH
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  #12  
Old 01-20-2008, 11:54 AM
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Join Date: Jun 2007
Location: North Idaho
Posts: 1,822
DUH,

Go to my article I have on reading the wind. You will find a diagram I drew describing what I believe is happening to you. With a head wind over the terrain features you describe you will get a lift from the wind blowing up the face of the draw closest to you. This effect is readable and correctable a certain amount (it still comes down to your best guess). In the diagram I have your exact shot (almost) based on your description. I would bet this whole issue is a wind over terrain thing. Two things, your scope height is probably 1.9-2.0", measure from center of barrel to center of scope to get this, also find some shots to shoot over flat terrainless ground. If your in canyon country it may be best to shoot down one side of the canyon to get away from the lifting effect.
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  #13  
Old 01-20-2008, 03:50 PM
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Join Date: May 2007
Location: VICTORIA AUSTRALIA
Posts: 912
Thanks Shawn for your help. I'll let you know how it goes !

DUH
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