You clearly don't know what QuickLoad is for. It's a computer modeling software that must be 'calibrated' against real world testing to account for minute differences in everything from chamber dimensions to primer brisance to powder hydration. But it's brilliant for quick-n-dirty answers to questions like, "What happens to my pressure curve if I switch from BLC-2 to RL-10X?", that sort of thing. You need at least a decent chrono to keep it honest and preferably a chrono and PressureTrace2. A chrono and a PressureTrace2 make Optimum Barrel Time load development a breeze.
Where QuickLoad really comes into its own is when you’re off into uncharted waters, such as a bullet and powder combination that no one has a chart for. Or if you load slick-coated bullets.
Slick-coated bullets (moly, WS2 or hBN) reduce fouling and can improve barrel life but they also reduce chamber pressure and cost you a little MV. So you have to increase the charge weight beyond the manufacturer’s suggested max load to get reasonable velocity, so mfgr’s data no longer applies. QuickLoad gives you the means to work up a safe load with less guesswork (you still need to watch for signs of excessive pressure on spent casings).
I bought QuickLoad specifically to do Optimum Barrel Time load development with it. OBT uses exactly the same principles as Optimum Charge Weight load development except it measures what it’s looking for in terms internal ballistics rather than external ballistics. They’re both looking for the same solution but from different ends of the rifle range. It lets me work up a round that shoots bugholes with the fewest rounds expended and fewest trips to the range. It’s half science and half voodoo and as long as you sprinkle the blood of a fresh-killed rooster on your loading bench and do your work under the light of a full moon, it can’t miss.