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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
WildcatBullet 338 cal 350 gr elevation at 2000 yards ???
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<blockquote data-quote="Brent" data-source="post: 65847" data-attributes="member: 99"><p>338/378 Wby 4.1" OAL 300gr SMK, 32" Pac-Nor bbl.</p><p></p><p>This is only a 100 yard test and might prove a little different BC numbers at 300 yards or more. The measured distance to the acoustic target is very critical and BC's can be off considerably if not measured to within 1/10 of a foot. Obviously because of this, the further away it is placed, the less error there will be with an identical distance measurement error.</p><p></p><p>Next time I'll test with two chronos, which I have not done with the 300gr SMK.</p><p></p><p>A little info on what you see here and how it works:</p><p>The acoustic target uses three acoustic microphones, each one located on a point of the triangle frame. The mach wave from the passing bullet triggers each "stop" sensor. The start screen located on the chrono rail starts the clock. With a starting and stoping point, the time of flight to target(TOF2T) is measured. With a known MV, and TOF, the downrange velocity (Vel-T) and BC can thus be calculated. </p><p></p><p>TOF is also captured in another section for each individual microphone in order to triangulate the exact bullets path/location through the three sensors.</p><p></p><p>With the use of a chamber attached strain gage peak pressure (Peak) is also calculated.</p><p></p><p>You can see the difference here is, the acoustic target relies on TOF and MV to determine BC and Vel-T, where two chronos know the exact MV and Vel-T to calculate the BC. The distance measurement of two chronos is thus much more forgiving and not nearly as critical. </p><p></p><p><img src="http://www.hunt101.com/img/232150.JPG" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Brent, post: 65847, member: 99"] 338/378 Wby 4.1" OAL 300gr SMK, 32" Pac-Nor bbl. This is only a 100 yard test and might prove a little different BC numbers at 300 yards or more. The measured distance to the acoustic target is very critical and BC's can be off considerably if not measured to within 1/10 of a foot. Obviously because of this, the further away it is placed, the less error there will be with an identical distance measurement error. Next time I'll test with two chronos, which I have not done with the 300gr SMK. A little info on what you see here and how it works: The acoustic target uses three acoustic microphones, each one located on a point of the triangle frame. The mach wave from the passing bullet triggers each "stop" sensor. The start screen located on the chrono rail starts the clock. With a starting and stoping point, the time of flight to target(TOF2T) is measured. With a known MV, and TOF, the downrange velocity (Vel-T) and BC can thus be calculated. TOF is also captured in another section for each individual microphone in order to triangulate the exact bullets path/location through the three sensors. With the use of a chamber attached strain gage peak pressure (Peak) is also calculated. You can see the difference here is, the acoustic target relies on TOF and MV to determine BC and Vel-T, where two chronos know the exact MV and Vel-T to calculate the BC. The distance measurement of two chronos is thus much more forgiving and not nearly as critical. [img]http://www.hunt101.com/img/232150.JPG[/img] [/QUOTE]
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WildcatBullet 338 cal 350 gr elevation at 2000 yards ???
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