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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Making sure I got this right
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<blockquote data-quote="bruce_ventura" data-source="post: 919099" data-attributes="member: 34084"><p>I would use a 20 MOA base for a few reasons. First, in most scopes the optical resolution starts to degrade when the internal adjustment exceeds about 25 MOA. You want your longest range shots to need less than 25 MOA adjustment. </p><p></p><p>Second, many production rifles have the barrels installed crooked. I install lots of scopes, and I regularly see misalignment between the ring axis and the rifle bore of 10 MOA or more. Custom rifles tend to have better barrel and base installation. Also, barrel vibration can throw impacts off of bore sight by 10 MOA or more on sporter weight barrels. Unless you know that your rifle does not have these issues, you should plan on needing an extra 10-15 MOA for misalignment and barrel vibration. A 20 MOA base will give you the extra margin. </p><p></p><p>Finally, the adjustment range is overstated by Vortex for some of their PST scopes. If you run the elevation adjustment to the limit, the field of view may be obscured at low magnification. The adjustment range without obscuration is about 1/2 turn less than the limit, so you may lose about a full turn of adjustment.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 919099, member: 34084"] I would use a 20 MOA base for a few reasons. First, in most scopes the optical resolution starts to degrade when the internal adjustment exceeds about 25 MOA. You want your longest range shots to need less than 25 MOA adjustment. Second, many production rifles have the barrels installed crooked. I install lots of scopes, and I regularly see misalignment between the ring axis and the rifle bore of 10 MOA or more. Custom rifles tend to have better barrel and base installation. Also, barrel vibration can throw impacts off of bore sight by 10 MOA or more on sporter weight barrels. Unless you know that your rifle does not have these issues, you should plan on needing an extra 10-15 MOA for misalignment and barrel vibration. A 20 MOA base will give you the extra margin. Finally, the adjustment range is overstated by Vortex for some of their PST scopes. If you run the elevation adjustment to the limit, the field of view may be obscured at low magnification. The adjustment range without obscuration is about 1/2 turn less than the limit, so you may lose about a full turn of adjustment. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Making sure I got this right
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