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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Any Tips for a New Loadbase User?
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<blockquote data-quote="Pdvdh" data-source="post: 393076" data-attributes="member: 4191"><p>I would like to simply provide a yes or no answer, but I can't without further information.</p><p></p><p>What were the environmental conditions at the time you zeroed your rifle 1/2" high at 300 yards? Those are the environmental condition values that should have been entered for the "Environment Conditions - Field" values. And then with the Field Conditions is ON box checked, you would have to open the Results tab in the Ballistics Module to ensure that the calculated bullet Path was/is 1/2" high @ 300 yds. If won't be if the field environment conditions are substantially different than the ICAO Standard Conditions. In fact the calculated Path (point of impact) at 300 yards will only match your entered Zero Height value in the Data tab if your field environment conditions were exactly ICAO conditions of 92.92 in/Hg, 59F, and 0%RH. If your field conditions are different that the ICAO conditions (they undoubtedly were), then you go back to the Data tab and modify the Zero Height input value until the Results Path value is the 1/2" high @ 300 yards under the field environmental conditions you experienced at the time you zeroed your rifle 1/2" high @ 300 yards. Finally, when the calculated Path at 300 yards matches your 1/2" high zero at 300 yards, <strong><u>Save that Tract</u></strong>. Now that the Tract is saved, you retrieve it from the Ballistics Database and modify the 'Environment Conditions - Field' values to whatever the actual conditions are at any other future time and location.</p><p></p><p>For purposes of clarification: the 'Environment Conditions - Sight In' values are established by the bullet manufacturer for their advertised BC, IF you're going to use a manufacturer's advertised BC. The 'Environment Conditions - Sight In' values for a bullet <u>are never changed</u> from the reference values the BC of the bullet was determined for - no matter how your Environment Conditions - Field values may change at differing locations and times. The <strong>ONLY</strong> location to input the field environmental condition values is in the 'Environment Conditions - Field' boxes. So you did enter the correct 'Environment Conditions - Sight In' values in your above example for the Berger bullet: 92.92 in/Hg, 59F, and 0%RH.</p><p></p><p>Now, <u>if you've developed and saved your sight in Tract in this manner</u> - <strong>THEN</strong> - when you go out to shoot at 1000 yards under your stated environmental conditions of:</p><p>station = 25.3</p><p>temp=67</p><p>hum=30</p><p>altitude=0</p><p></p><p>You would recall that saved Tract, enter these field conditions in the 'Environment Conditions - Field' value boxes, then make sure the 'Field Conditions is ON' box is checked, open the Results tab, and the Path and Click values should provide the correct dope for 1000 yd hits under your specified field environment atmosphere conditions. To get even more refined data, utilize the Spin Drift feature and the Coriolis feature at 1000 yds.</p><p></p><p>Making any sense?</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 393076, member: 4191"] I would like to simply provide a yes or no answer, but I can't without further information. What were the environmental conditions at the time you zeroed your rifle 1/2" high at 300 yards? Those are the environmental condition values that should have been entered for the "Environment Conditions - Field" values. And then with the Field Conditions is ON box checked, you would have to open the Results tab in the Ballistics Module to ensure that the calculated bullet Path was/is 1/2" high @ 300 yds. If won't be if the field environment conditions are substantially different than the ICAO Standard Conditions. In fact the calculated Path (point of impact) at 300 yards will only match your entered Zero Height value in the Data tab if your field environment conditions were exactly ICAO conditions of 92.92 in/Hg, 59F, and 0%RH. If your field conditions are different that the ICAO conditions (they undoubtedly were), then you go back to the Data tab and modify the Zero Height input value until the Results Path value is the 1/2" high @ 300 yards under the field environmental conditions you experienced at the time you zeroed your rifle 1/2" high @ 300 yards. Finally, when the calculated Path at 300 yards matches your 1/2" high zero at 300 yards, [B][U]Save that Tract[/U][/B]. Now that the Tract is saved, you retrieve it from the Ballistics Database and modify the 'Environment Conditions - Field' values to whatever the actual conditions are at any other future time and location. For purposes of clarification: the 'Environment Conditions - Sight In' values are established by the bullet manufacturer for their advertised BC, IF you're going to use a manufacturer's advertised BC. The 'Environment Conditions - Sight In' values for a bullet [U]are never changed[/U] from the reference values the BC of the bullet was determined for - no matter how your Environment Conditions - Field values may change at differing locations and times. The [B]ONLY[/B] location to input the field environmental condition values is in the 'Environment Conditions - Field' boxes. So you did enter the correct 'Environment Conditions - Sight In' values in your above example for the Berger bullet: 92.92 in/Hg, 59F, and 0%RH. Now, [U]if you've developed and saved your sight in Tract in this manner[/U] - [B]THEN[/B] - when you go out to shoot at 1000 yards under your stated environmental conditions of: station = 25.3 temp=67 hum=30 altitude=0 You would recall that saved Tract, enter these field conditions in the 'Environment Conditions - Field' value boxes, then make sure the 'Field Conditions is ON' box is checked, open the Results tab, and the Path and Click values should provide the correct dope for 1000 yd hits under your specified field environment atmosphere conditions. To get even more refined data, utilize the Spin Drift feature and the Coriolis feature at 1000 yds. Making any sense? [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Any Tips for a New Loadbase User?
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