I know QL charge-to-velocity is not always accurate. No surprise with all the variables in guns and components.
I was looking at the QL calcs from the pressure-to-velocity correlations. That's how I use it nowadays. Then I ladder up over the chrono, stopping where chrono velocity correlates to the 60-62K pressure calc.
Anyway, sounds like you have tested results, where I'm just making conversation/speculation.
Both of you always seem pretty solid.
