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Base and ring combo

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Bad Wolf View Drop Down
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    Posted: February/03/2010 at 06:43
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
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silver View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote silver Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 10:05
Why do you think that it is the mount and not some other part of the puzzel?
"If we weren't all crazy we, We would go insane."   Jimmie Buffet

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Bad Wolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bad Wolf Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 10:44
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 ....
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Rancid Coolaid View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 11:10
define "zero instability"?
Freedom is something you take.
Respect is something you earn.
Equality is something you whine about not being given.
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Bad Wolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bad Wolf Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 11:35
MPOI shift, extreme spread, about 0.8 MOA
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Rancid Coolaid View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 11:40
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?
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Bad Wolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bad Wolf Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 11:46
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
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Rancid Coolaid View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rancid Coolaid Quote  Post ReplyReply Direct Link To This Post Posted: February/03/2010 at 12:18
Sounds like a scope problem, not amount problem.
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Bad Wolf View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Bad Wolf Quote  Post ReplyReply Direct Link To This Post Posted: February/22/2010 at 05:50
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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