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Extreme Long Range Hunting & Shooting (ELR)
For ELR what constitutes a good zero?
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<blockquote data-quote="Professor Doolittle" data-source="post: 2473090" data-attributes="member: 118902"><p>Well in Hornady's 4DOF app they have a fine tuning adjustment called "axial form factor" for pulling in that last .25 inches. I think the max range of this fine tuning is like an inch, if you're off by more than that then the problem lies elsewhere. </p><p>Now if after that you then shoot a group at 800 yards and its off again but still correct at 600 yards then it could be a scope tracking error. That's assuming the app is correct, which is a good assumption. </p><p>The variation in muzzle velocity is the most important thing of all from the numbers. I have used Labradar with Berger bullets and a fantastic standard deviation for speed at 3100fps average is like 12fps. So plus or minus one std dev is 24fps which is the difference of a full click, .1mrads at 1000 yards. That means that the speed is all over the place over-washing a one click dialing error even with the best bullets. The probability chart is saying there's a 34.1% chance that the first bullet will be 12fps fast and a 34.1% chance the next bullet will be 12fps slow. So, that's where I would look first, that the velocity you input to the app is not exactly accurate.</p></blockquote><p></p>
[QUOTE="Professor Doolittle, post: 2473090, member: 118902"] Well in Hornady's 4DOF app they have a fine tuning adjustment called "axial form factor" for pulling in that last .25 inches. I think the max range of this fine tuning is like an inch, if you're off by more than that then the problem lies elsewhere. Now if after that you then shoot a group at 800 yards and its off again but still correct at 600 yards then it could be a scope tracking error. That's assuming the app is correct, which is a good assumption. The variation in muzzle velocity is the most important thing of all from the numbers. I have used Labradar with Berger bullets and a fantastic standard deviation for speed at 3100fps average is like 12fps. So plus or minus one std dev is 24fps which is the difference of a full click, .1mrads at 1000 yards. That means that the speed is all over the place over-washing a one click dialing error even with the best bullets. The probability chart is saying there's a 34.1% chance that the first bullet will be 12fps fast and a 34.1% chance the next bullet will be 12fps slow. So, that's where I would look first, that the velocity you input to the app is not exactly accurate. [/QUOTE]
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For ELR what constitutes a good zero?
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