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Long Range Hunting & Shooting
Help calculating a BC from two speeds
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<blockquote data-quote="aroshtr" data-source="post: 168067" data-attributes="member: 9176"><p>I actually used one chronograph. I have a CED M2. What I did was shoot a five shot group with the chrono at "about" 10 feet, and then moved the chrono to the target at 200 yards. I then shot another 5 shot group. Then shot one more 5 shot group with the chono left at 200 yards. I only got 7 readings with the chrono at 200 yards, 3 the frist time and 4 the second after a sight adjustment. The wind was blowing at me about 10-15 MPH from about 75deg out of the left. I had a couple shots that must have missed the "beam" of the chrono, but all still went through the screens. I then brought the chrono bach to 10 feet and shot another 5 shot group. Then took the averages of the 10 up close and the 7 far away. My extreme spread was 42fps up close, and 46fps at the longer range.</p><p> </p><p>Obviosly there is some room for error with the variations fps of the load and distance between the chronos. However the gun is only shooting about 1 moa groups , and at 800 yards there is also error from bullet impact within the groupiong. Not to include human error (which there is a lot of with me <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" />)</p><p> </p><p>So for now, I am looking a speed derived BC of about .530. It looks like the weather will cooperate on Friday, and I will see what the shot BC mathes these findings.</p></blockquote><p></p>
[QUOTE="aroshtr, post: 168067, member: 9176"] I actually used one chronograph. I have a CED M2. What I did was shoot a five shot group with the chrono at "about" 10 feet, and then moved the chrono to the target at 200 yards. I then shot another 5 shot group. Then shot one more 5 shot group with the chono left at 200 yards. I only got 7 readings with the chrono at 200 yards, 3 the frist time and 4 the second after a sight adjustment. The wind was blowing at me about 10-15 MPH from about 75deg out of the left. I had a couple shots that must have missed the "beam" of the chrono, but all still went through the screens. I then brought the chrono bach to 10 feet and shot another 5 shot group. Then took the averages of the 10 up close and the 7 far away. My extreme spread was 42fps up close, and 46fps at the longer range. Obviosly there is some room for error with the variations fps of the load and distance between the chronos. However the gun is only shooting about 1 moa groups , and at 800 yards there is also error from bullet impact within the groupiong. Not to include human error (which there is a lot of with me ;)) So for now, I am looking a speed derived BC of about .530. It looks like the weather will cooperate on Friday, and I will see what the shot BC mathes these findings. [/QUOTE]
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Help calculating a BC from two speeds
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