Oh man...get ready to be overwhelmed in a good way.
If you need help getting going (it can be confusing at first), hit me up in PM or something. Once you get going with it, you're gonna be absolutely amazed at what you can get from that software.
Once you get it figured out, you take fired brass from the rifle you're working on, measure the actual water capacity of the brass from that very rifle, and then you're going to be able to get data for THAT rifle using whatever powder and bullet you want. And you'll quickly start to understand why some people will say "yeah, I am over max on that load..." No, they aren't. They're over book published max, but for their rifle, they are NOT over max.
I have a 30-06 that I run 57.0gr IMR4350 under a 165gr Partition. This should be a pretty hot load according to most books, clocking around 2900 an change. It's barely hitting 2700. When I measured case volume and then re-ran the numbers through QL, it precisely predicted my chrono-verified speeds. That rifle could go to 59-60 gr safely, where many CANNOT. It's because of it's chamber specifics.
I don't change the load, even though it's slow for an 06, because it's rock-solid reliable right at MOA to 300 yards. It's not a cloverleaf load, but it will shoot 3/4"-1" at 100 day in, day out, year in, year out....and 2" at 200, 3" at 300, etc. It just works, so I stick with it. Nothing's walking away from a good hit from a 165PT at 2700 anyway.
Anyway......your best thing to do with QL is partner it with a chrono. You can stop trying to read tea-leaves with regards to pressure...you're gonna KNOW. Look at the pressure data in your QL data, referenced to predicted speed. With your measured case volume, this is tailored to your rifle and will be highly accurate. At that point, you watch your chrono, as your speeds will track to your pressure in your QL data, and you'll know what speed you can't exceed. Whether you have a sticky bolt, flat primers, etc, makes no matter. Physics are physics. Your chrono is your pressure gauge.
That's huge.