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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Help me learn to use my scope
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<blockquote data-quote="7magcreedmoor" data-source="post: 942118" data-attributes="member: 48559"><p>To adjust for ranges other than your zero distance, you first need accurate ballistic data for the load you shoot. If you don't have a way to measure your velocity, then check the published drop data from your ammo manufacturer and use that as a starting place. With your rig zeroed at 100 yards, use a tall target at the 300 yard line. I suggest getting some desk blotter pads (cheap, and usually measure about 16"x22" or so) and staple one above the other on cardboard. Put an aiming point at the very top edge of this, and fire a group aimed at that dot, without making any adjustment or holdover. Measure from aimpoint to center of the group. Now here is where life gets interesting. Your scope has MOA turrets, but a Mildot reticle, so you have two different kinds of math for adjusting- one way if you dial, but a different way if you hold. When you do decide to buy the next scope, I urge you to buy matching turret/reticle calibration. Doesn't matter which, just don't mix 'em i.e.: buy MOA turret/MOA reticle, OR Mil/Mil. (check out THLR.NO on youtube for a quick fix for your present scope). Now, let's say for example, that your 300 yard group is 22 inches down from the aiming point. One MOA is 1.047"@100yd, or 3.141" @300yds. 22/3.141=7 MOA. If you want to dial for range, dial up 7 MOA. OR... one milliradian (mil for short) is approx. 3.6 in @ 100yd, or 10.8" @ 300yds. 22 inches of drop divided by 10.8" = 2.03 mils. If you want to hold for distance, use the second dot below the reticle center. Sounds easy, right? Well here I must warn you that there is no guarantee the turrets or the reticle of your particular scope are accurate as advertised. I test every scope I buy for both turret tracking and reticle subtension before trying to shoot long range. One thing IS certain, you are going to have a great time learning all these things and will be glad you did. Google "box testing scope turrets" for starters..... and buy Brian Litz's book on applied ballistics for the "graduate course".</p></blockquote><p></p>
[QUOTE="7magcreedmoor, post: 942118, member: 48559"] To adjust for ranges other than your zero distance, you first need accurate ballistic data for the load you shoot. If you don't have a way to measure your velocity, then check the published drop data from your ammo manufacturer and use that as a starting place. With your rig zeroed at 100 yards, use a tall target at the 300 yard line. I suggest getting some desk blotter pads (cheap, and usually measure about 16"x22" or so) and staple one above the other on cardboard. Put an aiming point at the very top edge of this, and fire a group aimed at that dot, without making any adjustment or holdover. Measure from aimpoint to center of the group. Now here is where life gets interesting. Your scope has MOA turrets, but a Mildot reticle, so you have two different kinds of math for adjusting- one way if you dial, but a different way if you hold. When you do decide to buy the next scope, I urge you to buy matching turret/reticle calibration. Doesn't matter which, just don't mix 'em i.e.: buy MOA turret/MOA reticle, OR Mil/Mil. (check out THLR.NO on youtube for a quick fix for your present scope). Now, let's say for example, that your 300 yard group is 22 inches down from the aiming point. One MOA is 1.047"@100yd, or 3.141" @300yds. 22/3.141=7 MOA. If you want to dial for range, dial up 7 MOA. OR... one milliradian (mil for short) is approx. 3.6 in @ 100yd, or 10.8" @ 300yds. 22 inches of drop divided by 10.8" = 2.03 mils. If you want to hold for distance, use the second dot below the reticle center. Sounds easy, right? Well here I must warn you that there is no guarantee the turrets or the reticle of your particular scope are accurate as advertised. I test every scope I buy for both turret tracking and reticle subtension before trying to shoot long range. One thing IS certain, you are going to have a great time learning all these things and will be glad you did. Google "box testing scope turrets" for starters..... and buy Brian Litz's book on applied ballistics for the "graduate course". [/QUOTE]
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Help me learn to use my scope
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