A reloading manual would just seem like a joke after using and calibrating QuickLoad.
Powder mfgs, bullet mfgs, reloading equipment suppliers, or your range buddy, don't know diddly about your barrel, chamber, component lots, etc. All of this adds up to taking "everything with a grain of salt".
A QuickLoad file begins just as dumb as dirt, but you can adjust it for all that is impossible to predict.
Once you've made the adjustments, and validated results across a chronograph & with pressure signs where you expect, you can the run 'what-ifs' to immediately see all possibles -with fairly reliable predictions.
If I haven't tested a powder that I want to use yet, I prevalidate QL predictions with loads posted at Reloader's Nest.
Then at the range I watch my velocities as I go up in charges, based on QL's incremental workup, and I expect that they'll be right, or needing tweaked. But never have I been completely surprised by a predicted load.
It's a safe, sound approach.