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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: 393204" data-attributes="member: 4191"><p>I've also corresponded with Gus and received a similar response to the one received by Autorotate. Gus probably saved time by 'copying and pasting' his response to me to Autorotate. Or vica versa. </p><p></p><p>So I haven't fallen off the map. I'm engaged in one more round of correspondence with Gus in the effort to come to grips with the instructions Gus intended to be used to develop and save Tracts using LoadBase ballistics software. I'll provide some further input/clarification on my prior Posts after hearing back from Gus.</p><p></p><p>I differ on the position that field drops are an equivalent, or better method, to establish MV than the chronograph. If you're doing everything else correctly with LoadBase 3.0, then an accurate MV input is the key to accurate long range dope predictions. I know some advocate relying on field drop data to infer a BC or MV. It's true that if one develops a good drop chart at a known set of environmental conditions, that that drop chart can be good-to-go under those environmental conditions, without any chronograph, known MV, or even known atmospheric conditions. Because atmospheric density generally doesn't change so greatly from day to day to cause a miss if one remains at the same elevation. However, having and entering good, accurate data into an accurate ballistics program will allow for accurate predicted dope under any future atmospheric conditions, angled shots, differing elevations, tropical depressions, or high or low pressure systems, and account for spin drift and coriolis affects as well. </p><p></p><p>Gus has shared some comments from the U.K. military with me in the past which is slightly contrary to the approach of estimating MV base on BC and drops. LoadBase is in use by some portion of the U.K. military. Feedback from those troops is that all they really desire is an accurate MV. With a good MV, they're close to the point of skipping the field-proofing of their LoadBase predicted drops on targets in the field. They've employed LoadBase software enough times to become satisfied that their dope will be good, provided they have entered an accurate MV. </p><p></p><p>Even with an inherent potential error factor of 0.2% (this value extracted from Oehler), I still believe a quality chronograph used to establish MV is a better MV value for input to LoadBase software than a MV back-estimated from a manufacturer specified BC and measured drops in the field. If you hunt the same elevation and locations day to day, maybe it's less important. But my hunts take me from sea level to 7000 ft elevations, and angle (inclination and declination) shots are common at long range in the mountains I frequent. Under these variable elevations and atmospheric conditions, when I typically have no opportunity to pre-develop and prove field drops, I enjoy the confidence derived from good data in - good predicted drops out with LoadBase 3.0</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 393204, member: 4191"] I've also corresponded with Gus and received a similar response to the one received by Autorotate. Gus probably saved time by 'copying and pasting' his response to me to Autorotate. Or vica versa. So I haven't fallen off the map. I'm engaged in one more round of correspondence with Gus in the effort to come to grips with the instructions Gus intended to be used to develop and save Tracts using LoadBase ballistics software. I'll provide some further input/clarification on my prior Posts after hearing back from Gus. I differ on the position that field drops are an equivalent, or better method, to establish MV than the chronograph. If you're doing everything else correctly with LoadBase 3.0, then an accurate MV input is the key to accurate long range dope predictions. I know some advocate relying on field drop data to infer a BC or MV. It's true that if one develops a good drop chart at a known set of environmental conditions, that that drop chart can be good-to-go under those environmental conditions, without any chronograph, known MV, or even known atmospheric conditions. Because atmospheric density generally doesn't change so greatly from day to day to cause a miss if one remains at the same elevation. However, having and entering good, accurate data into an accurate ballistics program will allow for accurate predicted dope under any future atmospheric conditions, angled shots, differing elevations, tropical depressions, or high or low pressure systems, and account for spin drift and coriolis affects as well. Gus has shared some comments from the U.K. military with me in the past which is slightly contrary to the approach of estimating MV base on BC and drops. LoadBase is in use by some portion of the U.K. military. Feedback from those troops is that all they really desire is an accurate MV. With a good MV, they're close to the point of skipping the field-proofing of their LoadBase predicted drops on targets in the field. They've employed LoadBase software enough times to become satisfied that their dope will be good, provided they have entered an accurate MV. Even with an inherent potential error factor of 0.2% (this value extracted from Oehler), I still believe a quality chronograph used to establish MV is a better MV value for input to LoadBase software than a MV back-estimated from a manufacturer specified BC and measured drops in the field. If you hunt the same elevation and locations day to day, maybe it's less important. But my hunts take me from sea level to 7000 ft elevations, and angle (inclination and declination) shots are common at long range in the mountains I frequent. Under these variable elevations and atmospheric conditions, when I typically have no opportunity to pre-develop and prove field drops, I enjoy the confidence derived from good data in - good predicted drops out with LoadBase 3.0 [/QUOTE]
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