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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Vortex Viper PST reticle cant
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<blockquote data-quote="bruce_ventura" data-source="post: 838681" data-attributes="member: 34084"><p>I'm impressed that you took the time to measure the alignment error. You must be as OCD as I am. </p><p></p><p>I'm confident that the manufacturing variation at the factory is larger than 0.2 deg. I regularly see errors larger than that magnitude in production scopes. You probably have a good sample. I would not exchange it. </p><p></p><p>The worse-case aiming error is only 1-2" at 1,000 yds, which isn't much by most standards. You can mitigate that error somewhat, depending on how you align the ACD to the scope. I recommend that you plumb the elevation turret axis if you're dialing elevation, or plumb the reticle if you're holding off elevation. There may still be a small aiming error, however, when dialing a large elevation and hold off a high crosswind correction. Even still, error in wind estimation will probably dominate the reticle cant error. </p><p></p><p>FYI, most spirit levels used in ACDs have a sensitivity of 0.25 deg per millimeter of bubble movement. In the field most people will have difficulty holding the rifle cant during a shot to better than +/-0.25 deg (+/- 1 mm of bubble movement). The alignment error in the scope reticle is already lower than typical cant errors when an ACD is used.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 838681, member: 34084"] I'm impressed that you took the time to measure the alignment error. You must be as OCD as I am. I'm confident that the manufacturing variation at the factory is larger than 0.2 deg. I regularly see errors larger than that magnitude in production scopes. You probably have a good sample. I would not exchange it. The worse-case aiming error is only 1-2" at 1,000 yds, which isn't much by most standards. You can mitigate that error somewhat, depending on how you align the ACD to the scope. I recommend that you plumb the elevation turret axis if you're dialing elevation, or plumb the reticle if you're holding off elevation. There may still be a small aiming error, however, when dialing a large elevation and hold off a high crosswind correction. Even still, error in wind estimation will probably dominate the reticle cant error. FYI, most spirit levels used in ACDs have a sensitivity of 0.25 deg per millimeter of bubble movement. In the field most people will have difficulty holding the rifle cant during a shot to better than +/-0.25 deg (+/- 1 mm of bubble movement). The alignment error in the scope reticle is already lower than typical cant errors when an ACD is used. [/QUOTE]
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Vortex Viper PST reticle cant
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