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Long Range Hunting & Shooting
Range estimation with a duplex?
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<blockquote data-quote="jmbn" data-source="post: 6561" data-attributes="member: 1318"><p>I've ben using duplex reticles for range estimation for many years. I do it a little differently than the other posts on this thread; for many years I have kept a record of the back-brisket heights of animals. Based on these heights at 100 yds, I have a yardstick set up with these heights divided by 1/4, and set up the yardstick in my back yard at 25 yds (as opposed to 100). When calibrating a scope for AZ whitetail, for instance, which average about 14" for a good buck, I calibrate the scope to the 3 1/2" mark (14" divided by 1/4) by turning the power adjustment ring until the duplex steps just cover. I then record the power. </p><p></p><p>Obviously, if the deer on the hoof extends from step to step it's 100 yards away; if it extends from a step to the crosshairs it is 200 yard away, etc. Using this method, I can pretty accurately range to about 500 yards; then it gets a little shakey. Not as good as a rangefinder for the long shots, but faster. Also, not real good for a deer other than broadside.</p><p></p><p>I have 2 Leupold 2 1/2-8's and the duplex extentions are quite a bit different! The first was about right for elk, covering 24" at 2.6 power, but the second one couldn't be turned down enough to cover the 24". Also, don't assume that if a scope covers 12" at 6 power that it will cover 24" at 3 power; they do not have straight-line advances!</p><p></p><p>This system has never failed me, but I failed it once because I just didn't believe the scope. In the reticle the deer appeared to be in excess of 500 yards and I refused to believe that it was over 400. I held a little over its back and hit it in the knee! I eventually got it, but it took some chasing. So much for the 8 deer with 8 shots record of my 25-06.</p></blockquote><p></p>
[QUOTE="jmbn, post: 6561, member: 1318"] I've ben using duplex reticles for range estimation for many years. I do it a little differently than the other posts on this thread; for many years I have kept a record of the back-brisket heights of animals. Based on these heights at 100 yds, I have a yardstick set up with these heights divided by 1/4, and set up the yardstick in my back yard at 25 yds (as opposed to 100). When calibrating a scope for AZ whitetail, for instance, which average about 14" for a good buck, I calibrate the scope to the 3 1/2" mark (14" divided by 1/4) by turning the power adjustment ring until the duplex steps just cover. I then record the power. Obviously, if the deer on the hoof extends from step to step it's 100 yards away; if it extends from a step to the crosshairs it is 200 yard away, etc. Using this method, I can pretty accurately range to about 500 yards; then it gets a little shakey. Not as good as a rangefinder for the long shots, but faster. Also, not real good for a deer other than broadside. I have 2 Leupold 2 1/2-8's and the duplex extentions are quite a bit different! The first was about right for elk, covering 24" at 2.6 power, but the second one couldn't be turned down enough to cover the 24". Also, don't assume that if a scope covers 12" at 6 power that it will cover 24" at 3 power; they do not have straight-line advances! This system has never failed me, but I failed it once because I just didn't believe the scope. In the reticle the deer appeared to be in excess of 500 yards and I refused to believe that it was over 400. I held a little over its back and hit it in the knee! I eventually got it, but it took some chasing. So much for the 8 deer with 8 shots record of my 25-06. [/QUOTE]
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