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Rifles, Reloading, Optics, Equipment
Equipment Discussions
Chronograph accuracy
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<blockquote data-quote="Bearwalk" data-source="post: 436672" data-attributes="member: 24487"><p>I run a CED M2 in line with a Pro Chrono. I generally get 0 to 5 fps differences. Both return single digit std deviations. After years of frustration and trial and error, here's how I finally get repeatable and dependable results:</p><p></p><p></p><ul> <li data-xf-list-type="ul">Pro Chrono is set at 18' and CED at 21' to avoid muzzle blast. Use a ballistics program such as Ballistics FTE or Loadbase to correct your downrange velocities back to the muzzle. Adding 10 to 14 fps usually does it.</li> <li data-xf-list-type="ul">The CED M2 has infra-red screens with foam board "coffin" to ensure even lighting. Coffin is painted flat black.</li> <li data-xf-list-type="ul">Pro Chrono is shaded from direct sunlight with plywood on top of our overshot protection. For me, direct sunlight has always resulted in bad data. I avoid it like the plague.</li> <li data-xf-list-type="ul">I use surveyor tripods to get as stable a platform as possible. I have found that camera tripods move around from the blast and wind too much. Any minor movements will ruin your results.</li> <li data-xf-list-type="ul">For those with CED's, don't forget to tighten your sensor mounts with the provided pressure screws. Don't ask me why I put this reminder in.</li> <li data-xf-list-type="ul">I level the chronos in both directions and ensure my bullets are passing as as level and as square as possible thru the screens. Angled shots can produce 6-12 fps errors.</li> <li data-xf-list-type="ul">All surfaces are painted flat black or gray to avoid reflections. This includes all tripod and chrono surfaces that the bullet may "see".</li> <li data-xf-list-type="ul">I shoot on sandy soil, so I use a brown tarp underneath my setup to avoid ground reflections.</li> <li data-xf-list-type="ul">I never shoot over snow. Never had any good come of it.</li> <li data-xf-list-type="ul">I put in new batteries every other trip to ensure stable power.</li> </ul><p>Only thru this level of "anal-ness" have I been able to obtain useful shot data. I can't begin to tell you how much reliable velocity data has improved my load development. Coupled with now-useful models in Quickload, my load development and has become a quick and enjoyable process.</p></blockquote><p></p>
[QUOTE="Bearwalk, post: 436672, member: 24487"] I run a CED M2 in line with a Pro Chrono. I generally get 0 to 5 fps differences. Both return single digit std deviations. After years of frustration and trial and error, here's how I finally get repeatable and dependable results: [LIST] [*]Pro Chrono is set at 18' and CED at 21' to avoid muzzle blast. Use a ballistics program such as Ballistics FTE or Loadbase to correct your downrange velocities back to the muzzle. Adding 10 to 14 fps usually does it. [*]The CED M2 has infra-red screens with foam board "coffin" to ensure even lighting. Coffin is painted flat black. [*]Pro Chrono is shaded from direct sunlight with plywood on top of our overshot protection. For me, direct sunlight has always resulted in bad data. I avoid it like the plague. [*]I use surveyor tripods to get as stable a platform as possible. I have found that camera tripods move around from the blast and wind too much. Any minor movements will ruin your results. [*]For those with CED's, don't forget to tighten your sensor mounts with the provided pressure screws. Don't ask me why I put this reminder in. [*]I level the chronos in both directions and ensure my bullets are passing as as level and as square as possible thru the screens. Angled shots can produce 6-12 fps errors. [*]All surfaces are painted flat black or gray to avoid reflections. This includes all tripod and chrono surfaces that the bullet may "see". [*]I shoot on sandy soil, so I use a brown tarp underneath my setup to avoid ground reflections. [*]I never shoot over snow. Never had any good come of it. [*]I put in new batteries every other trip to ensure stable power. [/LIST] Only thru this level of "anal-ness" have I been able to obtain useful shot data. I can't begin to tell you how much reliable velocity data has improved my load development. Coupled with now-useful models in Quickload, my load development and has become a quick and enjoyable process. [/QUOTE]
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