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1000 yard problem

 
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  #1  
Old 06-24-2012, 01:00 PM
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Join Date: Jul 2011
Location: Eastern Washington State
Posts: 41
1000 yard problem

I tried shooting at 1000 yards for the first time the other day. I thought that my setup would give me plenty of elevation adjustment in my scope, but I ended up running my elevation to the max and using 3 additional mils of elevation ( using my mil dot as a crosshair.)
I am shooting a Savage 10FCP in .308 with a Ken Farelle 20MOA base and a Vortex Viper 6.5-20X44.
I'm running 178gr A-maxes at about 2650.

Anybody have any idea what I need to fix?

Thank you
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  #2  
Old 06-24-2012, 05:13 PM
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Join Date: Oct 2007
Location: Patagonia Mountains, Arizona
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Re: 1000 yard problem

The drop of a 178 Amax @ 1000 yards @ 2650 fps is 39 MOA at sea level relative to a 100 yard zero.

the Viper 6.5-20x44 scope specs say it has 68 MOA of elevation adjustment. Half of that (34 MOA ) should be available without the 20 MOA base. That alone should be within 5 MOA of sufficient adsjustment. With the 20 MOA Farrel base you should have 15 MOA to spare.

Are you sure your Ferrell base is 20 MOA? Farrell clearly marks the amount of wedge on each base. A flat base would give the results you're seeing. The base should also be marked that it's for a Savage action. What is the part number on the base?

Other possibilities:
The scope bell is sitting on the barrel because the rings are too low.
the range was closer to 1250 yards (not likely)
The MV was closer to 2350 fps (not likely)
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  #3  
Old 06-24-2012, 06:16 PM
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Re: 1000 yard problem

+1 on LouBoyd's response! Please don't take offense but don't want to assume anything or pretend it is impossible but make sure that if it is a 20 MOA, that it is not installed backwards.
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  #4  
Old 06-24-2012, 06:32 PM
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Join Date: May 2009
Location: Australia
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Re: 1000 yard problem

Something funny going on . Vortex says 65 MOA total elevation adjustment 32.5 MOA below the center .
The 178 A max at 2650 sighted at 100 yards would need around 39 MOA of elevation at sea level at 1000 yards . With 20 MOA on the rail that would leave only around 19 MOA to put on the scope . I agree with LouBoyd the base may not be tapered at all or tapered the wrong way .
If you measure the length , height at the front and back from the top to where it sits on the action in Imperial I can calculate the taper angle .
For a 6 inch long rail it should be .035 diffrence between front and back.
For a 7 inch .041 diffrenece , plus and minus a thou or two as not all rails are exactly the correct MOA.

Last edited by Bullet bumper; 06-24-2012 at 09:19 PM.
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  #5  
Old 06-24-2012, 06:41 PM
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Join Date: Jul 2011
Location: Eastern Washington State
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Re: 1000 yard problem

I was shooting at a 1000 yard shooting range,so I'm pretty confident about the distance. The cases have 43.5gr of Varget in them and I did chrono the load.

I bought the rifle with the base already on it. Everything looks good as far as the base is concerned. It is 20MOA and installed correctly.
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  #6  
Old 06-24-2012, 09:13 PM
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Re: 1000 yard problem

Quote:
Originally Posted by Perry View Post
I was shooting at a 1000 yard shooting range,so I'm pretty confident about the distance. The cases have 43.5gr of Varget in them and I did chrono the load.

I bought the rifle with the base already on it. Everything looks good as far as the base is concerned. It is 20MOA and installed correctly.
Perhaps the scope does not have the actual elevation adjustment as advertised.
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I voted for my "FREEDOM", "GUNS", and "MONEY" - keep the change - UNK.



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  #7  
Old 06-24-2012, 09:18 PM
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Join Date: May 2009
Location: Australia
Posts: 738
Re: 1000 yard problem

What kind of rings or mount system do you have on the rail ?
Did you measure the rail specs ?
Try this, center the elevation turret by screwing it all the way in one direction gently feeling the end of adjustment point don't over screw it . Then screw back 130 clicks or you can count the clicks all the way from right up to right down and click halfway back to center . Then add 19 MOA of elevation and shoot at 1000 , make sure you are screwing it the right way and adding elevation and not subtracting it . That should put 39 MOA on the gun . The POI should come at least close at sea level and maybe be high at higher altitudes.
I got a feeling you are screwing the elevation knob the wrong way . The base added 20 MOA and you subtracted a whole lot of MOA and then accounted for it with a 3 Mil of hold over on the Mil dot reticule . 3 mil at 1000 is 9 feet of hold over .
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