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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC Ballistics - drops don’t match ballistics chart
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<blockquote data-quote="John Spadaro" data-source="post: 1744546" data-attributes="member: 107723"><p>I went the 100y range today. Temp 83F. I started with a POI test with the last zero I used in the colder temp and higher elevation. The impacts were high by the same amount that I altered my zero for the elevation and temp change.</p><p></p><p>I did a tracking test on the VX - 6 scope. At 10 MOA the POI was 10.75", 20 MOA = 22', 25 MOA = 27.375". I also tracked R 5 MOA= 5.375", L 5 MOA= 5.5". Returned scope to zero and POI was good.</p><p></p><p>I also checked MV of frozen cartridges vs warm. The MV cold 3047, 83F warm 3089. The POI shift between warm and cold was 0.5 Up and 0.8 L.</p><p></p><p>My take on all this is that nothing is wrong with the scope, rifle, or mounts. The environmental changes caused the POI shift. I will need to re-zero again when I get to Montana.</p><p></p><p>I still don't understand why the drops do not correlate with the ballistic trajectory. Since the scope wasn't dialed between shots, it was not part of the equation. The only thing I can guess is that my bullet was shooting flatter out to 500y and the 600y drop was an anomaly. If I had shot groups I might have gotten more confidence in the data.</p></blockquote><p></p>
[QUOTE="John Spadaro, post: 1744546, member: 107723"] I went the 100y range today. Temp 83F. I started with a POI test with the last zero I used in the colder temp and higher elevation. The impacts were high by the same amount that I altered my zero for the elevation and temp change. I did a tracking test on the VX - 6 scope. At 10 MOA the POI was 10.75”, 20 MOA = 22’, 25 MOA = 27.375”. I also tracked R 5 MOA= 5.375”, L 5 MOA= 5.5”. Returned scope to zero and POI was good. I also checked MV of frozen cartridges vs warm. The MV cold 3047, 83F warm 3089. The POI shift between warm and cold was 0.5 Up and 0.8 L. My take on all this is that nothing is wrong with the scope, rifle, or mounts. The environmental changes caused the POI shift. I will need to re-zero again when I get to Montana. I still don’t understand why the drops do not correlate with the ballistic trajectory. Since the scope wasn’t dialed between shots, it was not part of the equation. The only thing I can guess is that my bullet was shooting flatter out to 500y and the 600y drop was an anomaly. If I had shot groups I might have gotten more confidence in the data. [/QUOTE]
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6.5 PRC Ballistics - drops don’t match ballistics chart
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