From my 6 yrs experience with QL software the default predictions means little other than ballpark unless used in tandem with a chronograph.
Powder burn rates vary with individual cartridges, loads and temperature making it imperative that QL powder burn rates (Ba) be adjusted to coincide with chronograph results for any particular load. From that point, using the adjusted burn rate, QL will provide very accurate predictions for that load in the same rifle at any given temperature. Often, burn rates have to be adjusted as much as 10% +/- to make a reliable prediction. Failure to adjust the burn rates accordingly can lead to some very high pressures. Been there, done that.
