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PS Since an ideal distance from the chrony is about ten feet, it's easy to shoot the chrony body with a scoped rifle. Don't ask me how I know. While it's ideal to shoot just a few inches over the chrony's body sensors, it's not ideal to shoot the chrony, LOL.
I've seen a few chronographs that suffered at the hands of shooters with a scoped rifle. I have a simple and not too expensive solution. I bought one of the inexpensive Laser Bore Sighters that sell for around $25. As a "Bore Sighter" they're "so-so" but when used to see where the bullet will pass over the sensors of a chronograph they're great. I set my rifle up on the "bags", align it with my target, and put the bore sighter in the muzzle. With it turned on, I set up my chronograph. The laser "dot" shows where the bullet will go regardless of my line of signt. My Chronograph is a PACT XP Professional (printer and IR sensors) which uses some plastic screen supports which also double as glare guards from side light flashes. I've made some lexan screens that I put between the supports with circles in the sweet spot for the sensors. They slip in quickly, allow me to see the dot while adjusting the tripod, and slip out real quick. Total setup time for the tripod and sensors is about 1 minute. Unlike the "Shooting Chrony's" the "brains" of the Pact Chronograph are back at the shooting table. Even if one were to hit a sensor it's a $25 repair part. Almost cheap enough to have a spare on hand.