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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How do I get my extreme deviation or spread DOWN?
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<blockquote data-quote="MMERSS" data-source="post: 840315" data-attributes="member: 63748"><p>What were your weather conditions? cloudy, sunny, changing etc.</p><p>What chronograph are you using?</p><p></p><p>It's not uncommon to have a fluctuation in MV readings for some chronographs with a change in lighting conditions plus their inherent error during readings. My Chrony chronographs I only trust so much. With a Chrony, if I'm around the 20 to 30 FPS ES and good 100 yard results I'm off to test at least 300 yards and verify my vertical spread. Oehler chronographs are significantly more reliable, predictable and accurate.</p><p> </p><p> If you are certain of your MV readings a slight change in bullet seating depth and powder charge weight can change the ES, for the better or worse. Making slight adjustments in one direction or the other can make all the difference.</p></blockquote><p></p>
[QUOTE="MMERSS, post: 840315, member: 63748"] What were your weather conditions? cloudy, sunny, changing etc. What chronograph are you using? It's not uncommon to have a fluctuation in MV readings for some chronographs with a change in lighting conditions plus their inherent error during readings. My Chrony chronographs I only trust so much. With a Chrony, if I’m around the 20 to 30 FPS ES and good 100 yard results I’m off to test at least 300 yards and verify my vertical spread. Oehler chronographs are significantly more reliable, predictable and accurate. If you are certain of your MV readings a slight change in bullet seating depth and powder charge weight can change the ES, for the better or worse. Making slight adjustments in one direction or the other can make all the difference. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
How do I get my extreme deviation or spread DOWN?
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