1) The chrono is a CED M2
with the IR Skyscreens. Due to intense sunlight, somedays even with the IR skyscreens, I'll fashion up 24"x36" piece of cardboard and make an impromptu hood to shade the sensors.
With the IR screens it's never "missed" a shot without the hood...it just makes me feel better I guess.
I've never compared it to another one though.
2) Best I can measure, I'm .015 from the lands with those velocities.
3) I forgot about this I did correct for this below.
After correcting for temperature (83 F), adjusting start pressure to 8500, and moving case weighing factor to .39, QL now predicted the velocites from my four different powder charges within 10 fps.
It also did well on some loads with H1000 that were previously fired....I'm thinking that might be the true "test" of the specific calibration technique....does it translate into accurate results when changes are made to the powder charge, or powder type itself.
You did say something interesting though....the 118 grains on the case capacity.
Wouldn't you use the SAAMI unfired case capacity for the unfired brass, despite it being fired in a Improved chamber?
After applying the above correction factors, and having QL "calibrated", now if place the case capacity up to 118 to 119 grains, it loses about 100 fps.
Thank you for the informative reply.