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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
New Leica Geovid Pro 10x42 AB+ with Shot Probability Analysis
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<blockquote data-quote="LRNut" data-source="post: 3005728" data-attributes="member: 3230"><p>I am guessing they are using Bryan Litz's WEZ models. I am a huge fan of this concept. Basically, it assumes you can shoot a certain group size (MOA or MRAD). Most shooters do not consider that their bullets do not all fly in one path, and consequently think they have 5" of what I will call wind error (assuming a ten inch target). But even a 1/2 MOA rifle will group 5" at 1000 yards, leaving only 2.5" of allowable wind error. In order to guarantee a hit, your allowable wind estimation error is less than 1 mph (actually, it is 1.1 mph if you shoot a .338 300 Berger at 2875 fps).</p><p></p><p>Complicating all of this is the fact the longer your TOF, the more a perfect wind call turns to crap. I recorded 45 seconds of wind speeds on a Kestrel and played it back frame by frame. I don't recall the exact numbers, but the wind changed within 1 second often enough to destroy a 90% hit probability at 1000 yards, and that was only with a wind that averaged 6 mph or so. Today at my CO place the wind is gusting enough every second to make a 760 gong an effort in futility and a 620 yard shot pretty dicey (I did hit at 520 but only shot once).</p><p></p><p>Good shooters don't miss because they can't hold steady - they misread the wind. Now how Leica knows your wind estimation ability, I can't answer.</p></blockquote><p></p>
[QUOTE="LRNut, post: 3005728, member: 3230"] I am guessing they are using Bryan Litz's WEZ models. I am a huge fan of this concept. Basically, it assumes you can shoot a certain group size (MOA or MRAD). Most shooters do not consider that their bullets do not all fly in one path, and consequently think they have 5" of what I will call wind error (assuming a ten inch target). But even a 1/2 MOA rifle will group 5" at 1000 yards, leaving only 2.5" of allowable wind error. In order to guarantee a hit, your allowable wind estimation error is less than 1 mph (actually, it is 1.1 mph if you shoot a .338 300 Berger at 2875 fps). Complicating all of this is the fact the longer your TOF, the more a perfect wind call turns to crap. I recorded 45 seconds of wind speeds on a Kestrel and played it back frame by frame. I don't recall the exact numbers, but the wind changed within 1 second often enough to destroy a 90% hit probability at 1000 yards, and that was only with a wind that averaged 6 mph or so. Today at my CO place the wind is gusting enough every second to make a 760 gong an effort in futility and a 620 yard shot pretty dicey (I did hit at 520 but only shot once). Good shooters don't miss because they can't hold steady - they misread the wind. Now how Leica knows your wind estimation ability, I can't answer. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
New Leica Geovid Pro 10x42 AB+ with Shot Probability Analysis
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