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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5-284 or 6.5 Creedmoor
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<blockquote data-quote="joep17" data-source="post: 1405813" data-attributes="member: 1457"><p>We sure do have huge temp swings where my club Range is.</p><p>The other thing is that every ballistic program I have ever tried is overly optimistic at long distance. I have settled on iSnipe and even then I go back and try to "force" it to fit my notes. My 155 scenars come out around 2950 fps. As chronogtaphed. When I try to force fit my come ups at 300, 400, 500, 600, 700, 800,'and 900 m the only way to get a close match is to lower the velocity in the program inputs to fit. Sometimes as much as 200 fps in the program. G1 is really incorrect at long ranges. G7 is way better but still not perfect</p><p></p><p>When we shoot electronic targets, they have sensors that report the velocity at the target. These are always lower than the ballistics programs estimate. Like in any science, there are therories and then test results.</p><p></p><p>The largest spread of 6 MOA came from 2 matches at the same range the same year with the same barrel and loads that were shot at -10C to +35C temp differences. Humidity also plays a role. It is mostly air density. I write down all the data I can.</p><p></p><p>One great thing about good notes on all shots is that it allows one scatch his head and wonder what is happening. </p><p></p><p>Your 4.25 MOA is still over 40" diff at 1000 yds. And in my experience, hornady has always been "optimistic" with the BC's they give. For that matter probably all manufacturers are. Then we go out and test.</p><p></p><p>Thanks for the response. It shows you are truly thinking about these things</p></blockquote><p></p>
[QUOTE="joep17, post: 1405813, member: 1457"] We sure do have huge temp swings where my club Range is. The other thing is that every ballistic program I have ever tried is overly optimistic at long distance. I have settled on iSnipe and even then I go back and try to "force" it to fit my notes. My 155 scenars come out around 2950 fps. As chronogtaphed. When I try to force fit my come ups at 300, 400, 500, 600, 700, 800,'and 900 m the only way to get a close match is to lower the velocity in the program inputs to fit. Sometimes as much as 200 fps in the program. G1 is really incorrect at long ranges. G7 is way better but still not perfect When we shoot electronic targets, they have sensors that report the velocity at the target. These are always lower than the ballistics programs estimate. Like in any science, there are therories and then test results. The largest spread of 6 MOA came from 2 matches at the same range the same year with the same barrel and loads that were shot at -10C to +35C temp differences. Humidity also plays a role. It is mostly air density. I write down all the data I can. One great thing about good notes on all shots is that it allows one scatch his head and wonder what is happening. Your 4.25 MOA is still over 40" diff at 1000 yds. And in my experience, hornady has always been "optimistic" with the BC's they give. For that matter probably all manufacturers are. Then we go out and test. Thanks for the response. It shows you are truly thinking about these things [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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6.5-284 or 6.5 Creedmoor
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