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Hunting
Long Range Hunting & Shooting
Is a scope level needed?
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<blockquote data-quote="Michael Eichele" data-source="post: 1014718" data-attributes="member: 1007"><p>The scope yes but your statement doesn't account for the fact that the mount doesn't stay directly between the bore and scope if the rifle is canted with a level scope.</p><p></p><p>The bullet also responds to angle of departure be it vertically or horizontally.</p><p></p><p>An exaggerated example would be if you mounted the scope 90 degrees to the receiver. Now assuming you're using a 0 degree base, you sight your rifle in at 100 yards with the rifle canted 90 degrees and the scope 'level'. You still use your vertical adjustment to get your elevation right. If your scope is mounted 2" from the receiver, you have to compensate by changing the angle of the scope so that the bullet would cross the line of sight to hit center. The problem is that while your scope is angled directly at your target at 0 degrees horizontally (line of sight) the barrel is not. The bullet departs the barrel at an angle not perpendicular with the target even though it strikes bullseye at your zero range. Since you scope's line of sight is zero degrees and if the bullet had exited perpendicular to the target, you hit 2" off center horizontally, hence the reason you have to adjust you windage to create a line of departure not perpendicular to the target so that your bullet will cross into the line of sight which happens to be your point of aim.</p><p></p><p>Now move your target back to 400 yards. Do you hit center of target horizontally? That's a negative. Why? Because the bullet didn't depart the barrel perpendicular to the target. It will only cross the line of sight horizontally at your zero range.</p><p></p><p>Then if you're shooting up/down hill, you interject another problem. Since the internal tube is perpendicular to the target, the main tube is not. Neither is your scope mounted level. As you angle the rifle up or down you get false readings on your level as it moves up or down. It's called the third axis.</p><p></p><p>Granted, this is an extreme case but illustrates the danger in not leveling the receiver and scope together.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 1014718, member: 1007"] The scope yes but your statement doesn't account for the fact that the mount doesn't stay directly between the bore and scope if the rifle is canted with a level scope. The bullet also responds to angle of departure be it vertically or horizontally. An exaggerated example would be if you mounted the scope 90 degrees to the receiver. Now assuming you're using a 0 degree base, you sight your rifle in at 100 yards with the rifle canted 90 degrees and the scope 'level'. You still use your vertical adjustment to get your elevation right. If your scope is mounted 2" from the receiver, you have to compensate by changing the angle of the scope so that the bullet would cross the line of sight to hit center. The problem is that while your scope is angled directly at your target at 0 degrees horizontally (line of sight) the barrel is not. The bullet departs the barrel at an angle not perpendicular with the target even though it strikes bullseye at your zero range. Since you scope's line of sight is zero degrees and if the bullet had exited perpendicular to the target, you hit 2" off center horizontally, hence the reason you have to adjust you windage to create a line of departure not perpendicular to the target so that your bullet will cross into the line of sight which happens to be your point of aim. Now move your target back to 400 yards. Do you hit center of target horizontally? That's a negative. Why? Because the bullet didn't depart the barrel perpendicular to the target. It will only cross the line of sight horizontally at your zero range. Then if you're shooting up/down hill, you interject another problem. Since the internal tube is perpendicular to the target, the main tube is not. Neither is your scope mounted level. As you angle the rifle up or down you get false readings on your level as it moves up or down. It's called the third axis. Granted, this is an extreme case but illustrates the danger in not leveling the receiver and scope together. [/QUOTE]
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Is a scope level needed?
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