Thread: Chronograph advice

The thing about optical chrono's is they are susceptible to a lot of variables, light (lack of or abundance of it) and shooting at a slight angle across the gates are just a couple.
I recently took an optical chrono out and over a week I shot the same load over it multiple times and on different days it gave different velocities. +/- 60fps but with similar e.s (extreme spread) which is the difference between highest and lowest velocity of a given load.
I was loosing my mind why I was getting vastly different velocities from the same load, till it was pointed out to me that optical chronos will give you consistent results but not necessarily accurate results.
This is fine if you can validate your velocity through drop you just need to be aware of it and work within the limitations.