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Base and ring combo

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 06:43
Bad Wolf View Drop Down
Optics GrassHopper
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Hi,
 
I have an Anschutz 1717 HMR which I use for varmint shooting out to 200 yards. I am experiencing some zero instability and am thinking maybe it's the way I'm mounting the scope.
 
At present I use the rail but the receiver is also drilled and tapped.
 
So, my question is, which would give me the most stable combination:
1/ rings with integral 11mm screw type dovetail bases
2/ screw in mounts and standard or dual dovetail rings
3/ screw on picatinny rail for weaver type rings
4/ something else
 
Thanks in advance.Big Smile
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 10:05
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Why do you think that it is the mount and not some other part of the puzzel?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 10:44
Bad Wolf View Drop Down
Optics GrassHopper
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Have swopped scopes,  raised and lowered torque settings for stock screws, practised with different marksmanship techniques, glass bedded action, lowered two stage trigger down to just over 1 lb, experimented with cleaned and dirty barrel ....
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 11:10
Rancid Coolaid View Drop Down
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define "zero instability"?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 11:35
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MPOI shift, extreme spread, about 0.8 MOA
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 11:40
Rancid Coolaid View Drop Down
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Groups move, "center-to-center" by 0.8MOA?

Does this happen in a range session or from one session to the next?

Are there any visible signs of the scope moving in the mounts?

What scope are you using (make and model)?


At what ranges are you seeing this 0.8MOA shift?

Does the rifle shoot tight groups, just shifted?

Has the rifle ever shot tight groups?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 11:46
Bad Wolf View Drop Down
Optics GrassHopper
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Originally posted by Rancid Coolaid Rancid Coolaid wrote:

Groups move, "center-to-center" by 0.8MOA? ..... yes

Does this happen in a range session or from one session to the next? ...... next session

Are there any visible signs of the scope moving in the mounts? .... no

What scope are you using (make and model)? ... Simmons WTC 6.5-20x50


At what ranges are you seeing this 0.8MOA shift? ...  100 yards

Does the rifle shoot tight groups, just shifted?  .... yes
 
Has the rifle ever shot tight groups? ... always
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/03/2010 at 12:18
Rancid Coolaid View Drop Down
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Sounds like a scope problem, not amount problem.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/22/2010 at 05:50
Bad Wolf View Drop Down
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Before posting this query, I had tried swopping scopes and as the problem remained I had discounted the scopes as being the source. However, on trying yet another scope the problem has been resolved.
 
What's the chances of that! Whacko
 
So, the advice from you guys was correct. Many thanks.  Excellent
 
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