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The Basics, Starting Out
Going from 165 to 168 - drop chart help
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<blockquote data-quote="Joaquin B" data-source="post: 472841" data-attributes="member: 20152"><p>tlk,</p><p> </p><p>I don't know if you have access to a long distance range, but I did the following, using the 500 meter rifle silhouette range in Tucson:</p><p> </p><p>1) Recorded the load's muzzle velocity, the temperature that day and the range's elevation, while zeroing the rifle at 200 meters on paper (needed 3 rounds).</p><p>2) Used the 300 meter gong to determine and record elevation settings (dialed up 3 MOA to start, needed 3 rounds - 2 to adjust, 1 to confirm). </p><p>3)Same with the 385 meter (dialed up to 6 MOA to start, Needed 3 rounds), and 500 meter gongs (dialed up to 9 MOA to start and needed another 3 rounds).</p><p> </p><p>Once I had my 200, 300, 385 and 500 meter settings, I set paper targets using the shoot-n-see type to get a view of the bullet impacts and repeated the process at 250 (started with 1 MOA), 350 (started at 4.5 MOA), 400 (started at 6 MOA) and 450 (started at 8 MOA) meters. This will be a lot easier if you have a portable gong...which I am now planning to build.</p><p> </p><p>I then toyed around with JBM Ballistics (internet freebie), setting the distances in meters and at 50 meter increments from 0 to 1000, then inputed different muzzle velocities until the software produced MOA adjustments which were very close very close to what I observed the various distances I shot at.</p><p> </p><p>I realized that the trajectories calculated by software differed somewhat to those determined by actual shooting, so I only use them as a reference.</p><p> </p><p>I will be now be using the adjustments recommended as starting points by the software program at distances beyond 500 meters, once I have my portable gong made. I use meters because, having been shooting silhouette for so long, I am used to measuring everything in meters.</p></blockquote><p></p>
[QUOTE="Joaquin B, post: 472841, member: 20152"] tlk, I don't know if you have access to a long distance range, but I did the following, using the 500 meter rifle silhouette range in Tucson: 1) Recorded the load's muzzle velocity, the temperature that day and the range's elevation, while zeroing the rifle at 200 meters on paper (needed 3 rounds). 2) Used the 300 meter gong to determine and record elevation settings (dialed up 3 MOA to start, needed 3 rounds - 2 to adjust, 1 to confirm). 3)Same with the 385 meter (dialed up to 6 MOA to start, Needed 3 rounds), and 500 meter gongs (dialed up to 9 MOA to start and needed another 3 rounds). Once I had my 200, 300, 385 and 500 meter settings, I set paper targets using the shoot-n-see type to get a view of the bullet impacts and repeated the process at 250 (started with 1 MOA), 350 (started at 4.5 MOA), 400 (started at 6 MOA) and 450 (started at 8 MOA) meters. This will be a lot easier if you have a portable gong...which I am now planning to build. I then toyed around with JBM Ballistics (internet freebie), setting the distances in meters and at 50 meter increments from 0 to 1000, then inputed different muzzle velocities until the software produced MOA adjustments which were very close very close to what I observed the various distances I shot at. I realized that the trajectories calculated by software differed somewhat to those determined by actual shooting, so I only use them as a reference. I will be now be using the adjustments recommended as starting points by the software program at distances beyond 500 meters, once I have my portable gong made. I use meters because, having been shooting silhouette for so long, I am used to measuring everything in meters. [/QUOTE]
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The Basics, Starting Out
Going from 165 to 168 - drop chart help
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