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Hunting
Extreme Long Range Hunting & Shooting (ELR)
Rifle Cant With Level Scope, Fact Or Fiction?
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<blockquote data-quote="el matador" data-source="post: 1119670" data-attributes="member: 12193"><p>The top 2 numbers are only dependent on the horizontal offset of the scope with respect to the bore. That amount of offset will be the amount of error you get at each multiple of your sight-in distance. So if you have .25" of offset and zero at 100 yards:</p><p></p><p>At muzzle: -0.25"</p><p>100 yards: 0"</p><p>200 yards: 0.25"</p><p>300 yards: 0.5"</p><p>1000 yards: 2.25"</p><p></p><p>Those numbers get pretty insignificant with a 200 or 300 yard zero.</p><p></p><p>The bottom 2 numbers are dependent on your own bullet drop/elevation. Take the bullet drop at a given range and multiply by the sine of the cant angle. The example I used had 250.2" of drop at 1000 yards:</p><p></p><p>250.2 * sin5 = 21.89</p><p></p><p>The elevation would also be affected, but varies with the cosine. That is a fairly insignificant amount compared to the windage:</p><p></p><p>250.2 * (cos5 - 1) = -0.95"</p><p></p><p>So you'd hit 1" low and 22" right or left, whichever way you're canting.</p></blockquote><p></p>
[QUOTE="el matador, post: 1119670, member: 12193"] The top 2 numbers are only dependent on the horizontal offset of the scope with respect to the bore. That amount of offset will be the amount of error you get at each multiple of your sight-in distance. So if you have .25" of offset and zero at 100 yards: At muzzle: -0.25" 100 yards: 0" 200 yards: 0.25" 300 yards: 0.5" 1000 yards: 2.25" Those numbers get pretty insignificant with a 200 or 300 yard zero. The bottom 2 numbers are dependent on your own bullet drop/elevation. Take the bullet drop at a given range and multiply by the sine of the cant angle. The example I used had 250.2" of drop at 1000 yards: 250.2 * sin5 = 21.89 The elevation would also be affected, but varies with the cosine. That is a fairly insignificant amount compared to the windage: 250.2 * (cos5 - 1) = -0.95" So you'd hit 1" low and 22" right or left, whichever way you're canting. [/QUOTE]
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Rifle Cant With Level Scope, Fact Or Fiction?
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