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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Questions about my drop chart
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<blockquote data-quote="Chase723" data-source="post: 1849718" data-attributes="member: 21524"><p>Were you shooting in any wind? Was there any updraft or aerodynamic jump? Was your density altitude accounted for before firing? After answering that, the first thing I would do is measure your offset of your zero from your point of aim. Any error from the center of your zero to the center of your point of aim for your zero gets carried all the way out. Next, measure your sight height. Center of your bolt to the center of your ocular. If it's within an 1/8" your ok. If it's like 1/4" then you'll start to see some differences. After that, if you're using a regular chronograph then true your velocity at 500 or further. If your using a Magnetospeed or Labradar then use that velocity. The go shoot at distance again...hopefully in no/minimal wind if possible. Whatever deviation your seeing at distance (say consistently 0.5 MOA high and left or whatever) then add that to your zero offset. That should rectify it. You can't really true your BC until you shoot into the transonic zone.</p></blockquote><p></p>
[QUOTE="Chase723, post: 1849718, member: 21524"] Were you shooting in any wind? Was there any updraft or aerodynamic jump? Was your density altitude accounted for before firing? After answering that, the first thing I would do is measure your offset of your zero from your point of aim. Any error from the center of your zero to the center of your point of aim for your zero gets carried all the way out. Next, measure your sight height. Center of your bolt to the center of your ocular. If it’s within an 1/8” your ok. If it’s like 1/4” then you’ll start to see some differences. After that, if you’re using a regular chronograph then true your velocity at 500 or further. If your using a Magnetospeed or Labradar then use that velocity. The go shoot at distance again...hopefully in no/minimal wind if possible. Whatever deviation your seeing at distance (say consistently 0.5 MOA high and left or whatever) then add that to your zero offset. That should rectify it. You can’t really true your BC until you shoot into the transonic zone. [/QUOTE]
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Questions about my drop chart
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