Not sure your logic makes any sense. Even though pressure and velocity is closely related, but they are also very different and I don’t believe a Chrono is a good devise used to measure the load pressure.
Just because a load is below the published velocity, it does not mean it’s always safe and vise versa.
The interior of a bore, the dia and twist rate all will affect the velocity. That said, some barrels are faster than the other. Pressure signs are pressure signs, if they are there than you should back off regardless of the velocity reading.
A Chronograph is used to measure the speed of a projectile. I use it to check the uniformity of my loads but its far from a strain gage which is the devise used to measure the load pressure.
