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Long Range Hunting & Shooting
Rifle canting and levels
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<blockquote data-quote="Hand Skills" data-source="post: 1374985" data-attributes="member: 103303"><p>This is an interesting point. I was mentored to install scopes while holding the rifle. I.e. I hold my rifle while somebody else rotates the reticle to plumb. This works really good if you shoot primarily offhand, or primarily sitting, and often there ones own anatomy induces some cant in the rifle. This is fine for shooting to intermediate (500-600yd) distances.</p><p></p><p>Truly long range shooting is a different discipline. Once vertical corrections reach several feet, well as we all know, small factors start to show up. For those who holdover, it becomes increasingly important that the reticle is plumb (through the bore). For those dialing, it becomes increasingly important that the vertical erector is parallel with the SCOPE/BORE AXIS.</p><p></p><p>Let me repeat that; if you are dialing it does not matter if your reticle is level - it's the mechanical assembly in the scope that needs to be aligned with the imaginary plane running through the center of your scope and bore.</p><p></p><p>Let's say your reticle is perfectly level as most people say (or plumb as we carpenters say). Your rifle is shot in a perfectly 'level' condition. Reticle cant will show up.</p><p></p><p>let's assume 2deg of relative difference between the reticle and the erector assembly;</p><p></p><p>For an example, we are dialing 16moa of elevation at 800yd.</p><p></p><p>16(MOA) x 8(hundred yards)= 128" of vertical 'come up'</p><p></p><p>Tan 2deg = 0.03492</p><p></p><p>128" x .03492 = 4.47"</p><p></p><p>2 degrees translates to almost 4.5" of error in this example. So, we have PERFECTLY levelled our reticle and our rifle, but have weird lateral POI shifts showing up.</p><p></p><p>This is why the 'tall target test' is so important.</p></blockquote><p></p>
[QUOTE="Hand Skills, post: 1374985, member: 103303"] This is an interesting point. I was mentored to install scopes while holding the rifle. I.e. I hold my rifle while somebody else rotates the reticle to plumb. This works really good if you shoot primarily offhand, or primarily sitting, and often there ones own anatomy induces some cant in the rifle. This is fine for shooting to intermediate (500-600yd) distances. Truly long range shooting is a different discipline. Once vertical corrections reach several feet, well as we all know, small factors start to show up. For those who holdover, it becomes increasingly important that the reticle is plumb (through the bore). For those dialing, it becomes increasingly important that the vertical erector is parallel with the SCOPE/BORE AXIS. Let me repeat that; if you are dialing it does not matter if your reticle is level - it's the mechanical assembly in the scope that needs to be aligned with the imaginary plane running through the center of your scope and bore. Let's say your reticle is perfectly level as most people say (or plumb as we carpenters say). Your rifle is shot in a perfectly 'level' condition. Reticle cant will show up. let's assume 2deg of relative difference between the reticle and the erector assembly; For an example, we are dialing 16moa of elevation at 800yd. 16(MOA) x 8(hundred yards)= 128" of vertical 'come up' Tan 2deg = 0.03492 128" x .03492 = 4.47" 2 degrees translates to almost 4.5" of error in this example. So, we have PERFECTLY levelled our reticle and our rifle, but have weird lateral POI shifts showing up. This is why the 'tall target test' is so important. [/QUOTE]
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