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CED Chrono, how accurate?
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<blockquote data-quote="CatShooter" data-source="post: 168564" data-attributes="member: 7"><p>Good morning AJ.</p><p></p><p>I didn't mention the separation thing because it's mentioned in all of the instruction books - Lake City uses 102 feet separation between the traps (cells), with a center distance of 73 feet (which is why civilian posting of velocities don't match military postings).</p><p></p><p>I use the 2 foot distance most of the time, but use the 4 feet separation when needed, and I have a 10 foot rail for the #33, but I have not used it in years.</p><p></p><p>The reason is this.</p><p></p><p>I find that I need averages and development patterns when developing loads, more than the exact figure.</p><p>If I get an average of 3643, and the "real" average is 3649, or even 3655, it doesn't effect anything I'm doing - ballistic drops are the same (+/- 0.147284937" at 1,000 yds <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>When I first got the #33, I dragged out that 10 foot pole every time, and thought it made a difference... if I really needed to know the exact speed, it would make sense, but we (now) know that the chronographs are not that accurate to start with... so why do it.</p><p></p><p>I guess what I'm saying is this - it is the ES and SD that are important in load development, especially for the long range shooter. And with short rails, you will still get the relative SDs and ESs... the average velocity will give you more accuracy than you need to do drop calcs with ballistic software - and those 10 rails are a real pain in the ***. <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>.</p></blockquote><p></p>
[QUOTE="CatShooter, post: 168564, member: 7"] Good morning AJ. I didn't mention the separation thing because it's mentioned in all of the instruction books - Lake City uses 102 feet separation between the traps (cells), with a center distance of 73 feet (which is why civilian posting of velocities don't match military postings). I use the 2 foot distance most of the time, but use the 4 feet separation when needed, and I have a 10 foot rail for the #33, but I have not used it in years. The reason is this. I find that I need averages and development patterns when developing loads, more than the exact figure. If I get an average of 3643, and the "real" average is 3649, or even 3655, it doesn't effect anything I'm doing - ballistic drops are the same (+/- 0.147284937" at 1,000 yds ;) ). When I first got the #33, I dragged out that 10 foot pole every time, and thought it made a difference... if I really needed to know the exact speed, it would make sense, but we (now) know that the chronographs are not that accurate to start with... so why do it. I guess what I'm saying is this - it is the ES and SD that are important in load development, especially for the long range shooter. And with short rails, you will still get the relative SDs and ESs... the average velocity will give you more accuracy than you need to do drop calcs with ballistic software - and those 10 rails are a real pain in the ***. ;) . [/QUOTE]
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