I've been using a $100 Competition Electronics chronograph for close to 20 years. If you take precautions, you should be able to shoot between the chronograph and sky screens without any problems.
A chronograph is a handy piece of kit for load development. What I like most about them is that I can verify muzzle velocities when changing powders or using the same brand and type of powder from a different lot.
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Last edited by T2C; 01-02-2017 at 12:10 AM.
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