Shooting Chrony advertises 99.5% accuracy ...@2000 fps. So they're admitting to a 10 fps random error. That extrapolates to 15 fps @3000 fps, 20 fps @4000. Good luck with your goal of an SD of 20 on your .204 loads when the chrono is randomly introducing a 20 fps error into your data.
A few years ago, the German defense laboratories tested the CED Millennium and found it 0.3% more accurate than the Oehler 35P. Since then, CED has replaced the Millennium model with the M2, which has a 12x faster processor than the Millennium did (and has at least 3x the precision of the model it replaced). They're $200, and if you add the optional infrared lighting, which makes them all but completely immune to unusual lighting conditions, they're still only 1/2 the price of an Oehler.
IMHO, the Competition Electronics Pro Chrono Digital is a better option than ANY Shooting Chrony (25% faster/more precise timing circuitry) and they're only $120.
Remember that comparing two chronos still only tells you how they differ. It DOES NOT tell you which is the more accurate.
Last edited by XL5; 11/05/12.
