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I use a ProChrono, like it a lot. They're a little more expensive than a Chrony (run around $110). I'm on my second one, they don't stand up well to misplaced rounds. I also don't use it downrange anymore, keep it 5 yards from the muzzle.

For a rough check on accuracy, a .22 LR over it will tell me if it is operating correctly with the light that's available. I'm playing with using artificial light to take the variables introduced by clouds, sun position, etc. I can plug in easily since one of my ranges is directly out my back door.

I've built some shields for use with shotgun loads, also move it in closer for that. Results there are fair, with a lot of false readings due to muzzle blast.

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