Thread: Velocity Increase During A Shooting Session

"I'm using an F1 Chrony and was blessed with an overcast afternoon and it captured every single shot. Absolute accuracy - who knows ?"

Before you read too much into the change in velocity of your loads you might want to consider finding a Labradar or Garmin to measure your loads with. The optical chronographs can be a bit interesting with changes in light conditions - I had one tell me my load was over 100fps different from an hour earlier also on an overcast day.