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Joined: Nov 2003
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Campfire Ranger
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Originally Posted by irfubar
I have had 2 Leupold 3.5-10 scopes that the last revolution of the elevation turret did not move the cross hairs.
If you are going to dial do not trust a Leupold


Well, not without verifying it at several range sessions. smile


"Only Christ is the fullness of God's revelation."
Everyday Hunter
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Campfire Outfitter
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A 6x or 10x SWFA milquad scope may save you a lot of time and frustration.

Joined: Mar 2006
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Originally Posted by 30338
A 6x or 10x SWFA milquad scope may save you a lot of time and frustration.


Very good advice...

Joined: Dec 2014
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J
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J
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Leupold MOA scopes are NOT 1/4" clicks at 100 yards. They are true MOA, which is 1.047" at 100 yards, or .26" per click at 100. This of course compounds as you move to distance.

Second, I didn't see anywhere where anyone suggested looking at atmospherics. They play a drastic role in your dope, especially when you get past 700-800 yards. If you're doping for one density altitude, but shooting in another you can easily miss targets at 800-1000 yards. It's important to make sure you have barometric STATION pressure, along with actual altitude and temperature. Set humidity to 50% and forget about it. If these settings aren't taken in account for those distances you can easily miss your target.

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Actually if you are going with station preasure, you can ignore altitude all together. Altitude is only needed if you're using barometric pressure. If using baro, altitude is used to calculate what air pressure should be above sea level at your location which may not accuratly reflect your atmospheric condition. Station pressure is most accurate since it reports actual environmental preasure in the area the intended shot will occure. Knowing the actual preaaure, temp, and to a lesser degree humidity is far more important since this physicaly influences the projectile flight path between shooter and target no matter the altitude.

Altitude is important only if using barometric pressure. Without altitude you cant calculate preasure above sea level. Air has less density the higher the altitude becomes. Other factors that influence air density of course is temp and humidity to a lesser degree. It is the density of the air which affects drag the ballistics resolvers are looking for.

Other things that affect bullet flight over ELR shots are wind speed, wind direction, spin drift, and the coriolis effect. Then you need to input twist rate of your tube, and azimuth for coriolis, and a kestrel for wind speed. Get a kestrel with applied ballistics, and practice.

Last edited by BriGuy; 09/17/17.
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C
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The only way station pressure doesn't need any adjustment is if the "station" is at the exact altitude you're shooting at and in the local vicinity. Since National Weather Service (NWS) reporting stations across the country are located at numerous altitudes, their reports are normalized to sea level to allow the NWS to make maps of pressure changes over distance. The normalized sea level pressure is also useful for anyone nearby by making a simple adjustment using the altitude at your current location.


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