Yep. See if you can detect the voice of experience in any of these:\
1) Before shooting, make sure your gun is reasonably well sighted in to make sure you don't shoot the chrony.
2) Before attempting to shoot an experimental load based on long, streamlined bullets, make sure your gun is shooting these without keyholing the bullets so that you don't shoot your chrony full of keyholing bullets.
3) Try to shoot when the sun is overhead, not on the horizon. This is because readings can be weird or wrong in side-light
4) Shoot at least 20 feet away from the chrony so that muzzle blast doesn't disturb the unit.
Hope you enjoy it. I wouldn't want to be without a chronograph. It'll give you good information.