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chronies measure speed by timing the shadow of the bullet as it crosses the first sensor to the second sensor. Smoke, muzzle flash, unburned powder, too much direct sun or even the light flicker from the alternating current in artificial light can throw them off.
for pistol ammo I would say you had some pretty good loads there.
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“How do I get to the next level?” Well, you get to the next level by being the first one on the range and the last one to leave.” – Jerry Miculek
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