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Author Topic: scope mount issue I think  (Read 1110 times)

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Offline greyling

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scope mount issue I think
« on: February 18, 2007, 01:13:51 PM »
I just got back from the range with my new .223 ultra, and it shoots way way to the left. with the scope adjusted to the right all the way it is still grouping about 3 inches to left at 40 feet. I'm shooting winchester 55 grain fmj, and tried reversing the rings and remountig the scope with the same result. any ideas other than call HR's supposedly wonderful customer service tomorrow?
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Offline stimpylu32

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Re: scope mount issue I think
« Reply #1 on: February 18, 2007, 02:09:05 PM »
greyling

Pull the scope and look down the base to see if it is running true to the barrel , also is it a factory installed base ? if so you may need to pull the base , clean out the mounting holes and lap in the base then re-mount the base .

Take some fine grit sand paper , lay it on top of the frame , lay the base on the sand paper and work it back ans forth till the base has a true fit with the frame .

Once everything is re-mounted and the scope is back to center pick a spot on the wall about 25 to 50 feet , look down the bore of the barrel and see if the cross hairs are anywere close to the spot on the wall .

If all else fails they make a set of ajustable offset rings that may be needed .

hope this helps .

stimpy
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Offline Fred M

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Re: scope mount issue I think
« Reply #2 on: February 18, 2007, 02:22:29 PM »
You either have the base mount holes drilled off line or the bore is off center.
With the scope being that much off center lapping the rings is not going to do it.

By using the Burris Z-rings with the excentric inserts  you might get to center.

Or send the barrel back to H&R and ask for a straight barrel.
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Fred M.
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Offline Fred M

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Re: scope mount issue I think
« Reply #3 on: February 18, 2007, 02:46:31 PM »
My calculations indicate your front ring needs to move 0.067" to the left.
At present you are off by 52.5" at 100 yards. Your max scope adjustment is about 30 min. from center and you are still 22.5 min to far left or 52.5min from the optical center of the scope.

The Burris excentric rings will only give you 2x0.020" max.

Sum ting wong very crooket.
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Fred M.
From Alberta Canada.

Offline quickdtoo

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Re: scope mount issue I think
« Reply #4 on: February 18, 2007, 02:59:35 PM »
Remove the base, clean the holes in the barrel, then just put the front and rear screws in the mount holes. Place a long straight edge against one side of the screws and compare it to the centerline of the barrel, if there's any runout, you need a new barrel or mount holes to be redrilled and the same for the base, H&R will take care of it. It could also be a base that's not made right, a straight edge along the base will tell you that too. ;) An even more serious issue would be the bore isn't centered in the barrel, but that should be apparent from one end or the other.

Tim
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Offline DalesCarpentry

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Re: scope mount issue I think
« Reply #5 on: February 18, 2007, 03:51:35 PM »
Do you guys think it could just be the scope? Just a thought.
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Offline PartsMan

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Re: scope mount issue I think
« Reply #6 on: February 19, 2007, 05:42:35 AM »
He should be able to check the scope by zeroing it.
lay it in some v blocks and adjust untill you can turn it and not move the crosshairs on a distant target.
If the scope is that bad you couldn't get it zeroed.
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Offline greyling

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Re: scope mount issue I think
« Reply #7 on: February 19, 2007, 05:51:19 AM »
I don't think it is the scope. I pulled it off my savage bolt gun where it had been doing great and stuck in on the handi. The crosshairs were wy way off when I bore sighted it, and I just can't move the hairs over enough to get it where the bore is pointing. sounds like a mount to me.
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Offline quickdtoo

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Re: scope mount issue I think
« Reply #8 on: February 19, 2007, 06:59:26 AM »
You can center the reticle using Leupold's method, I've used it for a few years, works very well on most scopes. It beats the counting clicks method since some turret adjustments will jam at the end of their travel.

Tim

Quote
Centering of a scope's adjustment dials
The elevation and windage adjustments of a scope are easily centered. Place a small mirror against the objective end of the scope. That would be the end farthest from your eye as you look through the scope. Make certain that the mirror is large enough to cover the entire objective. It must also be flat against the objective. With the scope's power selector ring set at the lowest magnification, look through the eyepiece as you would while aiming at a target. If the scope's windage and elevation adjustments are off center, you will see two images of the reticle (cross-hair). To reach the center of the adjustment range, simply turn the elevation and windage dials until you see only one image of the reticle.

http://www.leupold.com/resources/MyInfo81/Answerbook/Answers/668.aspx
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Offline oneshotonekill

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Re: scope mount issue I think
« Reply #9 on: February 19, 2007, 10:41:02 AM »
What kind of rings are you using?  A friend of mine once played hell with a scope in Millet Angle locks, he was tightening them down from one side which was putting the scope off the bore's center causing the same problem you have experienced.  When you said you reversed the rings did you swap them front to rear or rotate them 180 degrees?
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Offline greyling

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Re: scope mount issue I think
« Reply #10 on: February 19, 2007, 11:19:59 AM »
I'm using weaver quad locks. an I reversed the rings 180 and front to back. when you put the mirror in front of the scope do you do it flush, or set it off and inch or so so light can get in?
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Offline greyling

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Re: scope mount issue I think
« Reply #11 on: February 19, 2007, 11:21:03 AM »
nevermind on the mirror part of the previous post. I guess I should read more carefully.
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Offline quickdtoo

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Re: scope mount issue I think
« Reply #12 on: February 19, 2007, 11:37:28 AM »
If you can't get enough light thru it to see the reticle image, try a thicker mirror or place a piece of glass between the mirror and scope to act as a spacer. I find that with 99% of scopes, just experimenting with the light source angle is the key, but some scopes just don't work very well, the image is too dark to see good enough.

Tim
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