I have just loaded up some of these 180gr XTP's, in new Win brass, using 800x starting at 8.0 grains and increasing in 0.2gr increments to 9.6. I will be checking every shots brass and won't hesitate to stop at any sign of pressure. I will first test in my Match EAA Witness and if it passes, my G20. I am fully prepared to stop at any point and have to pull bullets. We'll see. I will post back my results.
BTW Hornady's handbook sixth edition just arrived and it has the best info I've ever seen as to WHY each barrel is an entity unto it's self and why pressure can vary so much from barrel to barrel, or even the same barrel over time. Very good resource.
This is fun!