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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A tale of two chrony's
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<blockquote data-quote="Mikecr" data-source="post: 345134" data-attributes="member: 1521"><p>I use 20ft primary screen spacing on a 35P, and found it to be the biggest ES improvement within my capabilities. </p><p>But it still does not accurately reflect MV.</p><p>For one, there is around 12-15fps of velocity decay over this range(20'), and a few fps between the muzzle and first screen, so averaged amounts to ~8fps low & unaccountd for.</p><p>You can also introduce more error if the bullet track isn't parallel to screen centerline. It don't take much..</p><p>I use a laser bore sighter to center the shots 5" above all sensors, and level them as well..</p></blockquote><p></p>
[QUOTE="Mikecr, post: 345134, member: 1521"] I use 20ft primary screen spacing on a 35P, and found it to be the biggest ES improvement within my capabilities. But it still does not accurately reflect MV. For one, there is around 12-15fps of velocity decay over this range(20'), and a few fps between the muzzle and first screen, so averaged amounts to ~8fps low & unaccountd for. You can also introduce more error if the bullet track isn't parallel to screen centerline. It don't take much.. I use a laser bore sighter to center the shots 5" above all sensors, and level them as well.. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
A tale of two chrony's
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