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Rifles, Reloading, Optics, Equipment
Reloading
Chronograph question
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<blockquote data-quote="BallisticsGuy" data-source="post: 1320860" data-attributes="member: 96226"><p>Short answer, maybe, but at a level that wouldn't be anything but statistical noise at best.</p><p></p><p>It really depends on the type of chronograph. All have idiosyncratic tendencies in one way or another. Inexpensive optical types (Shooting Chrony, ProChrono, etc...) like I think you're talking about have pretty narrow windows through which one fires so it'd be pretty hard to fire at an angle that would substantially affect the readings it will give and for it to give any reading at all. </p><p></p><p>The way they work is by sensing a drop in light reaching a pair of little dohicky's (photodiodes) that convert light to electrical signal. A drop in signal starts a timer and another stops it. Those kinds of chronographs also tend to run on fairly slow 8bit processors and the actual bits their circuits are made out of aren't anything special performance wise, so there's a good bit of available slop there. Up to around 3% or more on some has been documented. You could, I guess, get some additional error thrown in if the chronograph as a whole is oscillating backwards and forwards along the axis of the bullets travel and provided that that happens while a bullet is passing through the skyscreens but it'd be a trivial additional error compared to what you get out of one of those anyway and such a wind would likely knock the thing over.</p></blockquote><p></p>
[QUOTE="BallisticsGuy, post: 1320860, member: 96226"] Short answer, maybe, but at a level that wouldn't be anything but statistical noise at best. It really depends on the type of chronograph. All have idiosyncratic tendencies in one way or another. Inexpensive optical types (Shooting Chrony, ProChrono, etc...) like I think you're talking about have pretty narrow windows through which one fires so it'd be pretty hard to fire at an angle that would substantially affect the readings it will give and for it to give any reading at all. The way they work is by sensing a drop in light reaching a pair of little dohicky's (photodiodes) that convert light to electrical signal. A drop in signal starts a timer and another stops it. Those kinds of chronographs also tend to run on fairly slow 8bit processors and the actual bits their circuits are made out of aren't anything special performance wise, so there's a good bit of available slop there. Up to around 3% or more on some has been documented. You could, I guess, get some additional error thrown in if the chronograph as a whole is oscillating backwards and forwards along the axis of the bullets travel and provided that that happens while a bullet is passing through the skyscreens but it'd be a trivial additional error compared to what you get out of one of those anyway and such a wind would likely knock the thing over. [/QUOTE]
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Chronograph question
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