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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Holding over compared to dialing in MOA
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<blockquote data-quote="TiroFijo" data-source="post: 18152" data-attributes="member: 974"><p>Hi Brent</p><p></p><p>1) I recommend setting the turret 0 to match your "scope elevation" 0. </p><p>Theoretically this is parallel to the bore; this is not at rest but at the moment of bullet exit because there could be some angle due to harmonics or "jump" at the time the bullet exits the muzzle. </p><p>For example for a 308 firing a 175 SMK @ 2700 fps, std. cond., sight height is 1.7" and drop at 100 yds is 2.5". No matter what the original angle between scope erector and bore is, or what is the "jump", at the moment you are zeroed at 100 yds you have dialed into the scope: </p><p>A = (2.5" + 1.7")/1.047 = +4.0 MOA of elevation</p><p>Instead of setting the scope 0 at this point, I would substract 4.0 MOA and set the turret 0 there. </p><p>Your "scope elevation" for 100 yds will be 4.0 MOA from your scope 0.</p><p>If you normally dial 7.7 MOA to get to 400 yds from your 100 yds zero, now your "scope elevation" for 400 yds will be 4.0 + 7.5 = 11.5 MOA from your scope 0.</p><p>Etc.</p><p></p><p>2) You can leave the turret in any position, but (as with any scope) must remember in wich turn you are.</p></blockquote><p></p>
[QUOTE="TiroFijo, post: 18152, member: 974"] Hi Brent 1) I recommend setting the turret 0 to match your "scope elevation" 0. Theoretically this is parallel to the bore; this is not at rest but at the moment of bullet exit because there could be some angle due to harmonics or "jump" at the time the bullet exits the muzzle. For example for a 308 firing a 175 SMK @ 2700 fps, std. cond., sight height is 1.7" and drop at 100 yds is 2.5". No matter what the original angle between scope erector and bore is, or what is the "jump", at the moment you are zeroed at 100 yds you have dialed into the scope: A = (2.5" + 1.7")/1.047 = +4.0 MOA of elevation Instead of setting the scope 0 at this point, I would substract 4.0 MOA and set the turret 0 there. Your "scope elevation" for 100 yds will be 4.0 MOA from your scope 0. If you normally dial 7.7 MOA to get to 400 yds from your 100 yds zero, now your "scope elevation" for 400 yds will be 4.0 + 7.5 = 11.5 MOA from your scope 0. Etc. 2) You can leave the turret in any position, but (as with any scope) must remember in wich turn you are. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Holding over compared to dialing in MOA
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