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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
140g NBT @ 800 yards
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<blockquote data-quote="Michael Eichele" data-source="post: 139412" data-attributes="member: 1007"><p>[ QUOTE ]</p><p>Could it be the cold air, low elevation?? I dont know, I'm stumped, but I've noticed a lot lately that at 800 yards, I"m shooting anywhere from 2-4 MOA low with various comboes. I'm zeroing at a known distance, with known velocitys, so just dont know what else could be wrong for it to be that far off!? BTW, after noting where I needed to be click wise, hitting the 15" plate was piece of cake. NOthing substitutes getting out in the field and shooting, cant rely on the good ol computer for everything... </p><p> </p><p></p><p>[/ QUOTE ] </p><p></p><p>First, what kind of calculator are you using? Also, I assume you are using corect enviornmental data. Pressure, temp etc...If you go to this link <a href="http://weather.noaa.gov/index.html" target="_blank">http://weather.noaa.gov/index.html</a> and you can look up what the pressure was/is at the closest airport to your shooting location. If you had unusally high pressure, and you used a default in your software, that can contribute to a BC error. Are you sure your velocity is correct. Maybee check the chrony for accuracy. 300 FPS will throw things way off. If you plug in 3000 FPS (275 FPS slower) then you come up with a trajectory closer to what you are seeing based on the factory BC.</p><p></p><p>Try a differant chrony and let us know.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 139412, member: 1007"] [ QUOTE ] Could it be the cold air, low elevation?? I dont know, I'm stumped, but I've noticed a lot lately that at 800 yards, I"m shooting anywhere from 2-4 MOA low with various comboes. I'm zeroing at a known distance, with known velocitys, so just dont know what else could be wrong for it to be that far off!? BTW, after noting where I needed to be click wise, hitting the 15" plate was piece of cake. NOthing substitutes getting out in the field and shooting, cant rely on the good ol computer for everything... [/ QUOTE ] First, what kind of calculator are you using? Also, I assume you are using corect enviornmental data. Pressure, temp etc...If you go to this link [url="http://weather.noaa.gov/index.html"]http://weather.noaa.gov/index.html[/url] and you can look up what the pressure was/is at the closest airport to your shooting location. If you had unusally high pressure, and you used a default in your software, that can contribute to a BC error. Are you sure your velocity is correct. Maybee check the chrony for accuracy. 300 FPS will throw things way off. If you plug in 3000 FPS (275 FPS slower) then you come up with a trajectory closer to what you are seeing based on the factory BC. Try a differant chrony and let us know. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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140g NBT @ 800 yards
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