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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Crosshair levelling
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<blockquote data-quote="bruce_ventura" data-source="post: 709274" data-attributes="member: 34084"><p>$65 plus shipping? Ouch! </p><p></p><p>The EXD tool is $46 plus shipping, and even that's pretty high for something that rarely gets used. </p><p></p><p>The Parabola product is a flawed concept because it's attached to the eyepiece end of the scope, and it aligns the reticle to the receiver bore. That's too far away from the muzzle, and its reticle alignment with respect to the bore at the muzzle that counts. Boresight misalignment between the rifle bore and the scope tube axis and/or between the rufle bore and the receover can cause a lateral shift of the eyepiece relative to the bore. Aligning the reticle at this end is prone to more error than when done at the objective end. </p><p></p><p>The EXD tool is attached the objective, which is over the barrel and closer to the muzzle. Therefore it will be more accurate. When used properly, it plumbs the line intersecting the rifle bore and the scope tube axes. The reticle should be parallel to this line for long range shots. Plus it costs less. If you're shooting long range, the EXD tool is by far the best option available today. </p><p></p><p>If you're not shooting long range ( i. e., less than 400 yds), then you can just eyeball the alignment or level the receiver and reticle. The reticle would have to be off by at least 5 degrees for the aimpoint error to be significant at short range.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 709274, member: 34084"] $65 plus shipping? Ouch! The EXD tool is $46 plus shipping, and even that's pretty high for something that rarely gets used. The Parabola product is a flawed concept because it's attached to the eyepiece end of the scope, and it aligns the reticle to the receiver bore. That's too far away from the muzzle, and its reticle alignment with respect to the bore at the muzzle that counts. Boresight misalignment between the rifle bore and the scope tube axis and/or between the rufle bore and the receover can cause a lateral shift of the eyepiece relative to the bore. Aligning the reticle at this end is prone to more error than when done at the objective end. The EXD tool is attached the objective, which is over the barrel and closer to the muzzle. Therefore it will be more accurate. When used properly, it plumbs the line intersecting the rifle bore and the scope tube axes. The reticle should be parallel to this line for long range shots. Plus it costs less. If you're shooting long range, the EXD tool is by far the best option available today. If you're not shooting long range ( i. e., less than 400 yds), then you can just eyeball the alignment or level the receiver and reticle. The reticle would have to be off by at least 5 degrees for the aimpoint error to be significant at short range. [/QUOTE]
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