Quick Load question regarding powder burn rate
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..