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Long Range Hunting & Shooting
Adjusting bc or velocity to match drop
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<blockquote data-quote="Brant" data-source="post: 1473554" data-attributes="member: 21783"><p>Beating a dead horse here. A lot of good info in this thread already. without a kestrel for a live barometric pressure and temp reading you could easily have a 2 minute shift at 1150. Also make sure if you are putting the actual barometric pressure into your calculator you have the option to set the pressure to "absolute pressure". This means that your elevation is irrelevant because you are actually measuring the uncorrected barometric pressure and not a station pressure which is corrected to correlate with sea level pressure. This will actually make you impact high for a given distance though so probably not the issue here. So don't stress too much until you are shooting with a kestrel beside you. Also make sure if you can that you check your velocity on the same day that you are shooting long range because ammo temp can make a big difference depending on powder primarily in your velocity. If you got velocity data in hot weather and your ammo was hot temperature wise and you went out to distance with colder ammo this could be a factor that easily accounts for 2 moa at 1150. Just something to keep in mind and check your velocity in a multitude of different ammo temps to see how sensitive your particular load is.</p></blockquote><p></p>
[QUOTE="Brant, post: 1473554, member: 21783"] Beating a dead horse here. A lot of good info in this thread already. without a kestrel for a live barometric pressure and temp reading you could easily have a 2 minute shift at 1150. Also make sure if you are putting the actual barometric pressure into your calculator you have the option to set the pressure to “absolute pressure”. This means that your elevation is irrelevant because you are actually measuring the uncorrected barometric pressure and not a station pressure which is corrected to correlate with sea level pressure. This will actually make you impact high for a given distance though so probably not the issue here. So don’t stress too much until you are shooting with a kestrel beside you. Also make sure if you can that you check your velocity on the same day that you are shooting long range because ammo temp can make a big difference depending on powder primarily in your velocity. If you got velocity data in hot weather and your ammo was hot temperature wise and you went out to distance with colder ammo this could be a factor that easily accounts for 2 moa at 1150. Just something to keep in mind and check your velocity in a multitude of different ammo temps to see how sensitive your particular load is. [/QUOTE]
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Adjusting bc or velocity to match drop
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