For those of you who use QuickLoad... How much are you having to adjust the burn rate of the powder to reach the range measured velocity data?

I was using IMR-4064 and had everything adjusted really close. As I would increase charge weight, the velocity would follow nicely. I switched over to VARGET and determined the powder charge needed to achieve the barrel time of my 4064 load. Everything looked good on the screen and I went to the range expecting velocities around 2780 FPS. Well, first round I sent was 2867 FPS, almost a full hundred over what I expected. After coming back to the software from that range trip, I had to adjust the burn rate around 16% to get said velocity and as you can imagine I was OVER PRESSURE.

What kind of burn rate adjustments do you typically see? 3-5% or much greater???

Thanks..