Best to stick with the posted load data. A fast powder like tite group pressures can spike fast if your trying something thats not a listed load in a manual. different Shotshell primers can cause different pressure levels with the same powder charges as well. Hope this helpsThey only list 12 ga loads with tite group. I suppose I could start with a 12 ga load data and back it off a bit. I'm new to shotgun loading, the next shell that I load, will be my first.