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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Scope Levels- Why?
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<blockquote data-quote="LRNut" data-source="post: 1892123" data-attributes="member: 3230"><p>My last post was for the rifle canted but the scope reticle leveled. When I posted about the rifle/scope combo canted, I used JBM Ballistics and entered cant angles; that is where I came up with .1 MOA per deg of cant. But I will be the first to admit that sounds too little; if I cant at 800 I definitely see a large horizontal error (just go out and try it).</p><p></p><p>I once wrote a story about canting for The VARMINT HUNTER mag in which I used a protractor and two scope levels to measure various cants and their affects at 700 yards. There was definitely a difference.</p><p></p><p>As for spin drift, Bryan Litz measured it with two different rifles, identical in every way except one was left twist and the other right; he shot alternating shots and then used the difference between the groups to develop his formula for spin drift. The SIG Kilo calculates spin drift as well as aerodynamic jump. My hit rates at LR have gone way up since I got this; kicks the BR7's butt.</p><p></p><p>As J E Custom said, there are enough unknowns that I want to be sure I obviate the ones I can. I use a level simply to rule out cant. If a bullet hits to the right more than I thought it would, I know it was probably a bad wind call (esp if the second one does too). Without a level, I would be wondering if it was a cant error.</p></blockquote><p></p>
[QUOTE="LRNut, post: 1892123, member: 3230"] My last post was for the rifle canted but the scope reticle leveled. When I posted about the rifle/scope combo canted, I used JBM Ballistics and entered cant angles; that is where I came up with .1 MOA per deg of cant. But I will be the first to admit that sounds too little; if I cant at 800 I definitely see a large horizontal error (just go out and try it). I once wrote a story about canting for The VARMINT HUNTER mag in which I used a protractor and two scope levels to measure various cants and their affects at 700 yards. There was definitely a difference. As for spin drift, Bryan Litz measured it with two different rifles, identical in every way except one was left twist and the other right; he shot alternating shots and then used the difference between the groups to develop his formula for spin drift. The SIG Kilo calculates spin drift as well as aerodynamic jump. My hit rates at LR have gone way up since I got this; kicks the BR7's butt. As J E Custom said, there are enough unknowns that I want to be sure I obviate the ones I can. I use a level simply to rule out cant. If a bullet hits to the right more than I thought it would, I know it was probably a bad wind call (esp if the second one does too). Without a level, I would be wondering if it was a cant error. [/QUOTE]
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Scope Levels- Why?
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