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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2011 at 15:52
bugsNbows View Drop Down
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bowsNbugs

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Suppose a person would have the parallax changed (on a normal center fire rifle scope set at 150 yds.) down to 60 yards so that this scope could then be used on a rimfire critter banger... would that be a good thing or a bad thing? If done, then how would that affect say 100+ yard shot afterwards? Most shots would likely be closer rather than farther. Comments?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2011 at 15:55
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Chief Sackscratch

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by the time you paid for that change I'd just look for a rimfire scope or AO scope to use.  What you tying to do BNB?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/20/2011 at 21:41
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With a 42mm objective scope and 150 yard parallax setting, the maximum parallax error is 12.6mm at 60 yards.

If it is a 32mm objective scope with a 100 yard parallax setting, the MPE is 6.4mm at 60 yards.

If it is a 32mm objective scope changed to a 60 yard setting the MPE at 100 yards will be 10.66mm.

http://www.opticstalk.com/parallax-and-hunting_topic29003.html
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2011 at 00:01
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I see a big gain of the parallax change on a scope on a rimfire rifle, not only the parallax would be changed but also the focus. I prefer to take the parallax into 30-40 yards for a rimfire and that gives a tremendous difference on the foucus on higher magnification.

Either you pay for it, and it shouldend cost a lot as its a very easy modification or you do it your self. If you already know that you are one  of those who always messes things up, SWFA are going to be very happy because then you gotta buy a new scope.
If you are somewhat skilled with your hands and take it slow and easy its remarkably easy.
 
The front lens should be moved forward.
Mostly lowprice and midrange scopes have their fronlens mounted in a big screw that easay can be adjusted lengthwise. This big screw is locked by a big nut.
Release the nut, and screw the front lens package forward.
To having the proper tooling for this stuff is pretty good, as if you don't, SWFA will surely appreiciate the order of your new rimfire scope to replace the one you just destroyed.
 
Before moving the frontlens I place the scope on a stand where its stable without me touching it.
Its pointed at something at the disired distance and you should aim through the scope WITHOUT touching it. When aiming move your head slightly within what you can sideways and heightvise.
Please now note that the reticle is moving, please not in what direction your reticle is moving, is it the same way as your head is moving or the opposite.
Remember the direction.
 
Now move the front lens a 1/4 turn forward.
Repeat the exercise where you had the scope on the stand and moved your head.
Look on how much the reticle is moving, likely less than last time, and if the movement of the reticle is in the same direction as last time, then you can move the frontlens package a little bit more.
If not, you have to adjust it back a little bit.
 
When the reticle doesent move at all at the desired distance, the parallax is set at the new distance. This whole procedure will not take to many long time to do.
When the adjustments are done, you gotta retighten the locking nut again, without moving the frontlens package. So better check the parallax again after the nut is tightend.
 
Some scopes have its front lens package in a screw with a fixed placement on the tube. Zeiss and Pecar uses that method on their better lines, and should such a scope needs adjustment there is no simple ways, and the recomendation is to leave them as they are.
 
Håkan
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2011 at 02:43
Gerry Atric View Drop Down
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I have done the above operation as Håkan suggests, it´s absolutely something a handy person can do, but it can end up in a DIY-project (Destroy It Yourself) Wink
 
I´ll have a look-see if I can find a write-up from rimfire-central (with pictures). It would have been nice to have had internet 40 years ago (when funds were as low as the know-how) 
 
If the scope at hand (with "wrong" parallax range) is usable on another rifle, I would let it be and buy a designated rimfire scope, there´s a lot of them out there......
 
Gerry Atric
 
 
 
 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2011 at 05:40
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bowsNbugs

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Thanks Gents. I just have a perfectly good Leupy VX3 2.5-8 X 36 sitting in the safe. If I were to put this on a new (on order) Browning T Bolt in .17HMR, I assumed it would be more useful to have the parallax altered. I think the Leupy Custom Shop will do it for around $25. I just don't know if I should, or I should just pick up a scope more "designed" for rimfires. That's all...NBD. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/21/2011 at 06:13
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For 25 dollars I would let Leupold do the work.
 
I think both Håkan and yours truly haven´t had the luxury to live in a country with the convenience of inexpensive service from scope vendors.
 
I found an article (not the article on the net):
 
 
Gerry Atric
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/23/2011 at 12:05
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Send it to Leupold.
Lots of folks are buying the new Redfields and having Leupold set them to 60yds parallax like their rimfire scopes. It's cheaper/better than the VX1 rimfire models, and works just as well.

That said, it's a 17HMR that is probably going to be used from 50-150yds anyway. Honestly, I'd leave it with a 100yd setting, or if worried about it, get an AO scope like the Weaver RV9 or V16.
The 60yd parallax is really more for those using .22lr between 25-75yds.


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