Thread: Chronograph thoughts

Just wanted to see what people have to say about the various types of chrono available, I need to get the velocity data to setup my CDS dials so bought a Caldwell chrono and had some conflicting results which I think is partially due to user error but given the discrepancy it makes me wonder how accurate the data really would be even under ideal conditions.

So yesterday I set it up, overcast conditions which probably would've been perfect had I not fitted the sun shades. It reads about 2500fps
Today I do the same in sunny conditions, fit the sunshade however I'm pretty sure there was sunlight directly hitting the unit. It reads about 2600fps

A difference of 100fps just because of lighting conditions seems significant, so used correctly is the data reliable? is there anything I'm missing on top of that? is this style of chrono just garbage? lol