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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: 393113" data-attributes="member: 4191"><p>You could get pretty close predicted dope if your 'Environmental Conditions - Sight In' entered values aren't very different from the values referenced for the bullets published BC (in the Berger case the ICAO Standard Condition values). But I would expect substantial errors with the predicted dope if there was a significant difference - such as entering 'Environmental Conditions - Sight In' values for a location at 5000 foot elevation. Because the value for the BC of the bullet will no longer be 'close' to correct for those greatly different atmospheric pressures and resultant atmospheric density. The longer the range the greater the error in the predicted dope.</p><p></p><p>What elevation are you located for purposes of sighting in your guns, and your use of LB3? This will give us an idea as to how different your 'Environmental Conditions - Sight In' input values have been from the IACO Standard Condition values.</p><p></p><p>Again, my belief is that the correct 'Environmental Conditions - Sight In' input values are established by the reference values used to establish the manufacturer's advertised BC. They are not determined with a Kestrel at the time and location where you have sighted in your rifle. Because the advertised BC for the bullet is only the correct BC for that bullet under the reference environmental conditions used to establish, and specify, the bullets BC. The BC of a bullet is different for every different set of reference environmental conditions. And you're essentially changing the reference conditions, but not changing and correcting the BC, for those differing environmental (reference) conditions when you input non-reference environmental conditions into the 'Environmental Conditions - Sight In' input value boxes in LB3.</p><p></p><p>Oh Gus? Where are you in this time of need? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="Pdvdh, post: 393113, member: 4191"] You could get pretty close predicted dope if your 'Environmental Conditions - Sight In' entered values aren't very different from the values referenced for the bullets published BC (in the Berger case the ICAO Standard Condition values). But I would expect substantial errors with the predicted dope if there was a significant difference - such as entering 'Environmental Conditions - Sight In' values for a location at 5000 foot elevation. Because the value for the BC of the bullet will no longer be 'close' to correct for those greatly different atmospheric pressures and resultant atmospheric density. The longer the range the greater the error in the predicted dope. What elevation are you located for purposes of sighting in your guns, and your use of LB3? This will give us an idea as to how different your 'Environmental Conditions - Sight In' input values have been from the IACO Standard Condition values. Again, my belief is that the correct 'Environmental Conditions - Sight In' input values are established by the reference values used to establish the manufacturer's advertised BC. They are not determined with a Kestrel at the time and location where you have sighted in your rifle. Because the advertised BC for the bullet is only the correct BC for that bullet under the reference environmental conditions used to establish, and specify, the bullets BC. The BC of a bullet is different for every different set of reference environmental conditions. And you're essentially changing the reference conditions, but not changing and correcting the BC, for those differing environmental (reference) conditions when you input non-reference environmental conditions into the 'Environmental Conditions - Sight In' input value boxes in LB3. Oh Gus? Where are you in this time of need? :D [/QUOTE]
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