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Reticle Perpendicularity by Darrell Holland
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<blockquote data-quote="mkollman74" data-source="post: 224601" data-attributes="member: 7728"><p>I had basically this same question. One further question: Am I reading this wrong or is the suggestion to mount the scope perpendicular to the bore of the rifle? I have never understood how you can position anything in a relationship perpendicular to a round object. Since it is round, it really has no X or Y axis does it? Level is level, and plumb is plumb, right? If a cylinder is rotatated, up and down don't rotate with it, they are fixed in space. The bullet still exits the barrel, and gravity still pulls straight down on it. Any wind still deflects it to the same degree.</p><p></p><p>I do not mean to appear argumentative, I just don't understand, and wish to. I want to be better at this long range game. So, if the barrel is round, and I naturally cant the rifle, why shouldn't I mount my scope so that it appears perpendicular the horizon to my eye using my natural hold? The canting only rotates the barrel along its longitudinal axis, the bullet still travels the same path, right? </p><p></p><p>If I need extra elevation, and I dial it in or hold over, the impact will still travel in line with the vertical wire of my reticle because I am moving the canted rifle up to adjust to the new point of aim. The center of the barrel still moves in the same direction - up. Rotating the barrel by canting doesn't change the direction by which gravity pulls the bullet straight down, it doesn't alter the ballistic arc. So, I am still confused as to why a naturally canted hold on the rifle would produce an off shot unless the rifle itself were held perfectly perpendicular to the horizon for that shot. If I cant the rifle but have mounted my scope so that even with that cant its vertical wire is parallel to a plumbline, shouldn't that be OK? I can see where dialing elevation into a scope mounted at an angle to a rifle held perfectly plumb would produce a horizontal dispersion. </p><p></p><p>But holding a rifle at a slight cant and mounting the scope so that its reticle is parallel to a plumb line even given that cant should have the same effect as an offset type of scope mount such as was used on some M1s during WW2 by military snipers. In effect you are holding the rifle with the scope slightly to one side. Am I wrong? I barely passed high school geometry... Again, no flames, just curiosity and respect for the expertise on this forum.</p></blockquote><p></p>
[QUOTE="mkollman74, post: 224601, member: 7728"] I had basically this same question. One further question: Am I reading this wrong or is the suggestion to mount the scope perpendicular to the bore of the rifle? I have never understood how you can position anything in a relationship perpendicular to a round object. Since it is round, it really has no X or Y axis does it? Level is level, and plumb is plumb, right? If a cylinder is rotatated, up and down don't rotate with it, they are fixed in space. The bullet still exits the barrel, and gravity still pulls straight down on it. Any wind still deflects it to the same degree. I do not mean to appear argumentative, I just don't understand, and wish to. I want to be better at this long range game. So, if the barrel is round, and I naturally cant the rifle, why shouldn't I mount my scope so that it appears perpendicular the horizon to my eye using my natural hold? The canting only rotates the barrel along its longitudinal axis, the bullet still travels the same path, right? If I need extra elevation, and I dial it in or hold over, the impact will still travel in line with the vertical wire of my reticle because I am moving the canted rifle up to adjust to the new point of aim. The center of the barrel still moves in the same direction - up. Rotating the barrel by canting doesn't change the direction by which gravity pulls the bullet straight down, it doesn't alter the ballistic arc. So, I am still confused as to why a naturally canted hold on the rifle would produce an off shot unless the rifle itself were held perfectly perpendicular to the horizon for that shot. If I cant the rifle but have mounted my scope so that even with that cant its vertical wire is parallel to a plumbline, shouldn't that be OK? I can see where dialing elevation into a scope mounted at an angle to a rifle held perfectly plumb would produce a horizontal dispersion. But holding a rifle at a slight cant and mounting the scope so that its reticle is parallel to a plumb line even given that cant should have the same effect as an offset type of scope mount such as was used on some M1s during WW2 by military snipers. In effect you are holding the rifle with the scope slightly to one side. Am I wrong? I barely passed high school geometry... Again, no flames, just curiosity and respect for the expertise on this forum. [/QUOTE]
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