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M1 Garand scope problem
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I currently have a S&K scope base on my Garand. The problem I am having is the following: when I sight the rifle in at 200 yards and then adjust the elevation to say 300 yards, the windage changes considerably along with the elevation. I believe this is because the base, being offset to the left, is NOT parallel to the axis of the bore. The base has some adjustment available.
Any suggestions as to how I can get the base and bore axis parallel?
 
Posts: 28 | Location: Centennial, Colorado | Registered: 12 May 2007Reply With Quote
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Picture of sambarman338
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I don't suppose you're using an old Weatherby scope with the elevation and windage in the same turret, by any chance?

Those scopes (made by Hertal & Reuss in Germany) tend to seize up over time, so that when you twist the elevation the windage goes too.
 
Posts: 5161 | Location: Melbourne, Australia | Registered: 31 March 2009Reply With Quote
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Picture of Mike_Dettorre
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I would first check to make sure your reticle is perfectly level.

If not, then your adjustments are moving diagonally instead of straight vertical.


Mike

Legistine actu quod scripsi?

Never under estimate the internet community's ability to reply to your post with their personal rant about their tangentially related, single occurrence issue.




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Posts: 10164 | Location: Loving retirement in Boise, ID | Registered: 16 December 2003Reply With Quote
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Picture of richj
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an offset scope will always require windage adjustment when you change yardage... if you zero at a particular range.

lets say you are on at 200 with a 2" offset scope
the sight picture is a right triangle with a 2" base and your line of sight is the hypotenuse of the triangle.

this is a top view looking down at the rifle.



If you sight in with a 2" offset you should be able to have the scope parallel to the trajectory.
 
Posts: 6521 | Location: NY, NY | Registered: 28 November 2005Reply With Quote
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Picture of richj
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I should add that your point of impact will only be 1" to the left at 300 yards. 1" to the right at 100 yards. 0" at 200.
 
Posts: 6521 | Location: NY, NY | Registered: 28 November 2005Reply With Quote
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Not sure how your are describing the zero. An offset sight should be set up with the strike of the bullet equal to the offset. In the original M1 sniper scope the scope was 3/4' to 1' offset to the left of the bore. The impact of the bullet was always supposed to be this distance to the left of the point of aim. If you are zeroing the bullet to hit point of aim at 200 yards the point of impact will always be to the right at any point greater than 200 yards and to the left at any distance short of 200 yards. The drawing above shows this. Users of the M! sniper rifles were trained to ignore the offset. If properly set, the bullet would always be 3/4" to 1" left of the point of aim. In practical terms, 3/4" left of center mass was not a consideration. The trajectory stays the same, it is just always 3/4" to the right of the point of aim. If you use a 2" offset, the bullet will always be 2" to the right of the line of sight.
 
Posts: 277 | Location: Newton, MS | Registered: 08 August 2005Reply With Quote
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