Great opportunity for my first post.
Firstly, congrats on getting a crono. Very useful tool. I've used my CE Pro Crono since 1999. I've not used it in late dusk or early dawn lighting. I have used it on bright sunny, heavy overcast, and indoor shooting range lighting. Worked fine.
Of huge importance is that the crono be mounted on a solid, or, ridged base. A high end sturdy tripod. Or, invest in a folding "saw buck", saw horse. Any means of mounting it solidly will work.
Any instability, the muzzle blast will jostle the crono resulting in the corrupted velocities you are getting. The common low cost tripods are not solid enough in my opinion.
I'll add that I set the crono 12-15 feet ahead of the shooting bench. If you have a BB or pellet air rifle use that to get familiar with the cronos functions.
Last edited by TooDogs; 03-20-2008 at 08:47 PM.
Reason: add distance