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Still can't by my dope ?

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Unread 03-09-2008, 11:52 PM
Gold Member
Join Date: May 2007
Posts: 912
Still can't by my dope ?

The ongoing mystery continues with learning how to use exbal and my new rifle.

Today I went out and fired a cold bore shot at 1100 M. This was with 32.25 up. Exbal said 34.25 up.

Conditions were

89 temp
RH 42 %

FPS entered was 2830

I believe that my other data may be inaccurate as I had an Alt reading that was vastly differerent to the last time I fired from the same spot.

I have hopefully corrected this by calibrating the kestrel with a ALT and BP reading from the local airport weather station when I got home.

Anyway as the temp rose and conditions worsten I decided to just fire at a close target of 415 M.

Entered the range and a BP of 29.66 and dialed the 7 up and sailed at least 2 moa over the top. At this stage I did not think there was much up draft happening as the wind was 10 oclock 3-4mph.

This shot is down hill 20 degrees for 200 then rises about the same angle to the target.

I used cosine .99.

After the forth shot my elevation correction was back to 4 moa up and I still went over the top of the plate. Wind had swung to 7 0clock following and around 6 mph. Then I gave up because I felt either the high temps where at work again or something very fundamental is wrong in my settings To hit the plate I would of had to be less than half the ups exbal gave me ? Over a distance of only 415 this does not seem possible to me ?

I am going to check the 100 meter zero again, and short of the gun being way high at that range I am lost ?

Can anyone suggest what else I have not thought of that could cause the PDA and actual ups needed being so different ? I understand that the BC given to the 300 SMK by exbal is very accurate. The way I am going, the PDA is worthless when it is so far out.

What factors would you need for a 338 edge doing 2830 to only need less that 4 moa up over 415 m. I just dont see weather conditions being that big an influence over that distance ?

I have given the scope height 2 " above the bore which I think is reasonably accurate.

Hunting season starts in a few weeks and now I am tearing my hair out !

If I find this week that the 100 zero is dead on, where do I go ?

Signed....Frustrated..Cheers DUH
With each step in the bush, you are a step closer.
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Unread 03-10-2008, 04:30 AM
Gold Member
Join Date: May 2007
Posts: 912
I think I have found the gremlin !!!!!

The NF rail was loose and moving forward and back ! I have removed the scope in its rings and undone the 4 screws holding it down. They were all loose to varying degrees. The rear one of the front 2 had the bottom half of its thread gone and was just spinning in its hole ? I have cleaned the base and screws up and loctited them back in. I will need another screw for the front.

I feel this will have caused me all my grief. What do you guys think ??

I feel a bit better now....

With each step in the bush, you are a step closer.
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Unread 03-10-2008, 09:35 AM
Platinum Member
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,876

I'm glad you found something. I've been watching your agony/frustration with some intent.

I sure a glad that gravity still works evenly around the world, even when you are upside down.;)
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
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Unread 03-10-2008, 10:03 AM
Gold Member
Join Date: Apr 2006
Location: Alberta
Posts: 868
Good to hear that you've found something DUH. Like Roy said, hasn't been easy reading about your frustrations over the other side of the pond.

Good Hunting!
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Unread 03-10-2008, 10:47 AM
Silver Member
Join Date: Aug 2007
Location: bismarck ND
Posts: 406
the real question is did this solve your problem. have you shot it to make sure. i have been in your shoes may times. have a problem then think you have it fixed and realize that it was only part of it. i hope that this does solve it...
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Unread 03-10-2008, 03:57 PM
Gold Member
Join Date: May 2007
Posts: 912
Quess I just have to put it back together again after I get a new rail screw from Shawn.

The movement forward and back surely would cause elevation problems you would think ?

With each step in the bush, you are a step closer.
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Unread 03-11-2008, 04:05 PM
Bronze Member
Join Date: Oct 2007
Location: MT.
Posts: 41
Two words Lock-tite! Hope this helps.
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