I've been playing with this for a while now. It predicts the velocity of my old .270win load to 1fps off my chrono'd average. my .223 load to also 1fps off my chrono'd average and my .243 load to exactly my chrono'd average. How accurate do you find QL to be? How much can you trust the load/pressure data it gives you? For example apparently I can put 53.8gr of H4350 into a .270 win case, behind a 150gr SST and get 2990fps out of a 24" barrel, while remaining just inside SAAMI max pressure. Of course one would work up and watch for pressure signs... but how reliable is this sort of data?