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Do you guys just use a commercially manufactured round, shoot several times and correct for SD, Extreme Spread
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That would be a complete waste of time, since as soon as you shoot the "standard round" in
your gun, you have no idea what the speed should be. It is a great shock to new chrono shooters to find out how much speeds differ from one gun to another.
The chrono circuit calibration is easily checked on a bench to insure the circuits are right, and you can't check it by shooting, other than for gross failure---which is usually a setup problem.
I agree with PACT that the accuracy of the electronics is the least of your worries, and controlling the lighting, insuring the skyscrren spacing is correct, and keeping the muzzle blast out of the screens is your real problem. I helped one fellow who swore his chrono was no good, but he was too close and just starting the timing with the muzzle blast.