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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Good Scope Mounting Tools
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<blockquote data-quote="bruce_ventura" data-source="post: 850397" data-attributes="member: 34084"><p>Actually, using the vertical lines on the Reticle Alignment Tool to center the scope objective works very well. That's because this part of the alignment process does not require high precision, as long as the alignment is done at the objective end of the scope. The purpose of this part of the process is to prevent relatively large horizontal offsets (>0.1") between the scope tube and the rifle bore. </p><p></p><p>The geometry is simple: a 0.1" horizontal offset produces a 0.9" aiming error at 1,000 yds (assuming a 100 yd zero). For most shooters, that's acceptable aiming accuracy. Using the lines on the tool to center the scope tube easily allows alignment to within 0.1". </p><p></p><p>Doing this alignment at the eyepiece end of the scope (aligning the eyepiece to the rear of the receiver) is prone to errors when the barrel isn't boresight aligned with the receiver. I frequently encounter production rifles that have barrels installed crooked in the receiver. In that case, the rear of the receiver can be offset horizontally from the barrel axis. </p><p></p><p>The second part of the alignment process requires a spirit level that is accurate to within +/-15 MOA, and that is the tolerance to which the Reticle Alignment Tool is assembled. So, the tool is designed to provide the level off accuracy and precision needed, while keeping the cost down.</p></blockquote><p></p>
[QUOTE="bruce_ventura, post: 850397, member: 34084"] Actually, using the vertical lines on the Reticle Alignment Tool to center the scope objective works very well. That's because this part of the alignment process does not require high precision, as long as the alignment is done at the objective end of the scope. The purpose of this part of the process is to prevent relatively large horizontal offsets (>0.1") between the scope tube and the rifle bore. The geometry is simple: a 0.1" horizontal offset produces a 0.9" aiming error at 1,000 yds (assuming a 100 yd zero). For most shooters, that's acceptable aiming accuracy. Using the lines on the tool to center the scope tube easily allows alignment to within 0.1". Doing this alignment at the eyepiece end of the scope (aligning the eyepiece to the rear of the receiver) is prone to errors when the barrel isn't boresight aligned with the receiver. I frequently encounter production rifles that have barrels installed crooked in the receiver. In that case, the rear of the receiver can be offset horizontally from the barrel axis. The second part of the alignment process requires a spirit level that is accurate to within +/-15 MOA, and that is the tolerance to which the Reticle Alignment Tool is assembled. So, the tool is designed to provide the level off accuracy and precision needed, while keeping the cost down. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Good Scope Mounting Tools
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