CE ProChrono best distance?

Thank you Bruce, just what I was looking for. Going to be shooting 17- 23 ft/lbs rifles next weekend if the chronograph comes in. Ordered the indoor lighting kit as well. Bought them off Optics Planet after 5 minutes of price digging. Same price as amazon and amazon doesn't need my money.

Guess I will start at 9" and see how it goes. Will be shooting .177's and .22's to break in/ sight in and get some base lines as new.