$100 chrony is a waist of a $100.
Screw ballpark and then repeat and then true.
A $100 chrony is not consistent enough to test ES over or establish a true velocity.
A decent ballistics computer can put you spot on if your inputs are spot on. If you get real data with fewer rounds as described earlier "ballparking" or refining is unnecessary.
Forget round and round, cut to it..........dope it at 100, 500 and 1K. True velocity, true BC and real adjustments in your scope as they relate to each other.
After that if you can't shoot inside the accuracy potential of the rifle and your own wind call.........It aint the computers fault.