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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Weird Error In Ballistic Calculation
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<blockquote data-quote="BLC3128" data-source="post: 1747502" data-attributes="member: 101837"><p>I had the opportunity to test out my 7mm WBY magnum at extended range last weekend. I use JBM ballistics to calculate my dope... However while shooting I experienced a strange error in the calculation of my drop. I'm going to provide as much information as possible and I hope somebody can chime in, because I am now clueless.</p><p></p><p>DATA</p><p></p><p>Nosler 160gr. Accubond @3240 (10yds from chronograph)</p><p>Scope Elevation 1.561"</p><p>35 degrees , cloudy, wind (5-10 <----)</p><p>Elevation 1600' Pressure 29.7</p><p>Zero'd @ 275 yards</p><p>Shooting mountain to mountain (over a dry dam)</p><p></p><p>The ranges I shot were 435 yards, 575 yards, 700 yards, and 835 yards. The elevation data was very close for all of the ranges except for the 575 yard elevation data. I used other various free calculators and got the same results... I even played with the input of the ballistic data, muzzle velocity, zero, with various combos and the 575 yard data was always off...I'm stumped!</p><p></p><p>Range (SUGGESTED DROP) <strong>(ACTUAL DROP)</strong></p><p>435 yards - 3 MOA <strong> - 3.25 MOA</strong></p><p>575 yards - 6.3 MOA <strong>- 5.25 MOA</strong></p><p>700 yards - 9.6 MOA <strong>- 9.25 MOA</strong></p><p>835 yards - 13.5 MOA <strong>- 13.5 MOA</strong></p><p></p><p>Thanks in advance for your input.</p></blockquote><p></p>
[QUOTE="BLC3128, post: 1747502, member: 101837"] I had the opportunity to test out my 7mm WBY magnum at extended range last weekend. I use JBM ballistics to calculate my dope... However while shooting I experienced a strange error in the calculation of my drop. I'm going to provide as much information as possible and I hope somebody can chime in, because I am now clueless. DATA Nosler 160gr. Accubond @3240 (10yds from chronograph) Scope Elevation 1.561" 35 degrees , cloudy, wind (5-10 <----) Elevation 1600' Pressure 29.7 Zero'd @ 275 yards Shooting mountain to mountain (over a dry dam) The ranges I shot were 435 yards, 575 yards, 700 yards, and 835 yards. The elevation data was very close for all of the ranges except for the 575 yard elevation data. I used other various free calculators and got the same results... I even played with the input of the ballistic data, muzzle velocity, zero, with various combos and the 575 yard data was always off...I'm stumped! Range (SUGGESTED DROP) [B](ACTUAL DROP)[/B] 435 yards - 3 MOA [B] - 3.25 MOA[/B] 575 yards - 6.3 MOA [B]- 5.25 MOA[/B] 700 yards - 9.6 MOA [B]- 9.25 MOA[/B] 835 yards - 13.5 MOA [B]- 13.5 MOA[/B] Thanks in advance for your input. [/QUOTE]
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Weird Error In Ballistic Calculation
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