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Long Range Hunting & Shooting
Left @ 300 yds - Right @ 1000 yds? WTH?
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<blockquote data-quote="jmden" data-source="post: 248337" data-attributes="member: 1742"><p>The PC Exbal version does include both spindrift calculation, which can be selected to be included in windage calculations or not, and Coriolis force effects (select latitude and direction shooting to get this figure), which cannot be included into the windage calculations. Exbal indicates that there is a R or L component to Coriolis force as well as vertical component. For instance, I'm at about 48 deg N latitude where I practice shooting to 1K + and typically shooting in about a 330 deg True direction. The effect of the Coriolis force for my set up at 1K is calculated by Exbal at 2.9" R and 1.4" low. If I'm shooting 1K at the reciprocal direction of 150 deg True, the numbers are 2.8" R and 1.4" high. If I combine this with the spindrift calculation (Exbal says to shoot for this calculation at 500-600yds. My guess is that if you went much farther than this in shooting in STILL conditions to check spindrift that there would start to be enough effect from Coriolis force that effectively isolating the spindrift effect itself would be difficult--I'm not sure--would like to quiz Perry on that) it has explained almost perfectly the groups I routinely get at 880 or so and 1K+ that I had really been scratching my head at. This is all just educated (hopefully) guessing on my part. I need to do much more shooting to confirm.</p></blockquote><p></p>
[QUOTE="jmden, post: 248337, member: 1742"] The PC Exbal version does include both spindrift calculation, which can be selected to be included in windage calculations or not, and Coriolis force effects (select latitude and direction shooting to get this figure), which cannot be included into the windage calculations. Exbal indicates that there is a R or L component to Coriolis force as well as vertical component. For instance, I'm at about 48 deg N latitude where I practice shooting to 1K + and typically shooting in about a 330 deg True direction. The effect of the Coriolis force for my set up at 1K is calculated by Exbal at 2.9" R and 1.4" low. If I'm shooting 1K at the reciprocal direction of 150 deg True, the numbers are 2.8" R and 1.4" high. If I combine this with the spindrift calculation (Exbal says to shoot for this calculation at 500-600yds. My guess is that if you went much farther than this in shooting in STILL conditions to check spindrift that there would start to be enough effect from Coriolis force that effectively isolating the spindrift effect itself would be difficult--I'm not sure--would like to quiz Perry on that) it has explained almost perfectly the groups I routinely get at 880 or so and 1K+ that I had really been scratching my head at. This is all just educated (hopefully) guessing on my part. I need to do much more shooting to confirm. [/QUOTE]
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Left @ 300 yds - Right @ 1000 yds? WTH?
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