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Depending on BC, pellets lose only about 0.5% to 1% of their velocity per yard.

May 8 2005 at 4:10 PM

(Login pneuguy)

Response to Ok... what distance do you chrony your gun from?

So a foot or two makes only a few fps difference anyway.

Far greater sources of error come from such things as not having a Shooting Chrony completely unfolded, thus causing the sensors to angle toward each other and shorten the path over which the pellet's time of flight is measured. I can (sheepishly) attest that this causes HUGE errors. It had me thinking my .22 RWS94 was shooting over 800fps when the true figure was more like 775.

I still feel stupid when I think of it.

Non-optimum lighting will screw the readings up too. For example, a classic mistake is using a single light bulb over the middle of the chrony. This can make them overestimate the true velocity - sometimes by a VERY large amount.

Steve

This message has been edited by pneuguy on May 8, 2005 4:14 PM

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Are the errors always on the plus side of the equation? - Milehighguy on May 8, 2005, 4:25 PM

Todd, I think it is the altitude. The chrony will give error readings if not enough light. - Anthony on May 8, 2005, 4:40 PM

Not always up. The classic counterexample is if the muzzle is too close... - Steve in NC on May 8, 2005, 4:50 PM

Thanks, Steve, I edited my post to DOWN instead of UP...transposition.....tn - Anthony on May 8, 2005, 5:00 PM

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