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Hunting
The Basics, Starting Out
How much to adjust the scope to shoot 500 yards?
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<blockquote data-quote="Dave King" data-source="post: 51477" data-attributes="member: 3"><p>Ian</p><p></p><p> I use the drop tables generated by the computer programs as a starting point. They're generally very good but too many variables to be completely relied upon.</p><p> Once I have a set of computer generated I check the values against actual field data and use the known good field data as the rifle chart.</p><p></p><p> Sorry I didn't clarify that point very well.</p><p></p><p> I don't believe the mounting system effects the drop tables given that the mounts are the same height. Some mounts give a greater sight axis to bore axis distance, usually folks pick 1.5 inches for sight/scope height but for some of my high rings and the bigger 50mm objective scopes it may be as much as 1.75 or more.</p><p></p><p> I haven't seen any difference based on the rifle manufacturer if the actual bullet (chronographed) velocity is the same. But I'd guess that the way a bullet is engraved during it's time in the various barrels would cause the final effective Ballistic Coefficient to be different and that could cause some degree of variation at long range.</p><p></p><p> As for 'guessing' as to what a particular rifle's trajectory might be it no other data is available... I know the come-up data for the 308 Win and the 173 military match bullets. I call this data my standard set... for the faster magnum cartridges and the little fast varmint rounds I use a figure that's 2/3s the 308 come-up data, this usually gets me very near the proper value so I can get known good data from hits at various distances.</p></blockquote><p></p>
[QUOTE="Dave King, post: 51477, member: 3"] Ian I use the drop tables generated by the computer programs as a starting point. They're generally very good but too many variables to be completely relied upon. Once I have a set of computer generated I check the values against actual field data and use the known good field data as the rifle chart. Sorry I didn't clarify that point very well. I don't believe the mounting system effects the drop tables given that the mounts are the same height. Some mounts give a greater sight axis to bore axis distance, usually folks pick 1.5 inches for sight/scope height but for some of my high rings and the bigger 50mm objective scopes it may be as much as 1.75 or more. I haven't seen any difference based on the rifle manufacturer if the actual bullet (chronographed) velocity is the same. But I'd guess that the way a bullet is engraved during it's time in the various barrels would cause the final effective Ballistic Coefficient to be different and that could cause some degree of variation at long range. As for 'guessing' as to what a particular rifle's trajectory might be it no other data is available... I know the come-up data for the 308 Win and the 173 military match bullets. I call this data my standard set... for the faster magnum cartridges and the little fast varmint rounds I use a figure that's 2/3s the 308 come-up data, this usually gets me very near the proper value so I can get known good data from hits at various distances. [/QUOTE]
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The Basics, Starting Out
How much to adjust the scope to shoot 500 yards?
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