Well, you've lost me. That looks like Hodgdon's data for a jacketed Hornady XTP bullet, using a Winchester case and a Winchester SPM primer. If so, I'm using a Cast Performance gas-checked hard-cast boolit, Starline case and CCI SPM primer, so what does it have to do with me? Also, why do people keep telling me to stay within published load data? In my original post I very clearly state that I intend to do just that. I'm still waiting to hear back from Cast Performance to verify or deny it, but I have read claims that Cast Performance recommends a min. of 13 gr and a max. of 14 gr with this boolit using H110/W296, and that's the data that I intend to use, if it's verified. I'm just wondering why so much space in the case? Does H110 tolerate some empty space when you get up there in bullet weight? I've heard folks talk about charges so big with 125 grainers that the powder actually needs to be compressed! Perhaps the heavier bullet has enough inertia that it allows pressure to rise rapidly enough a little air space is ok, and a packed case might actually lead to too much pressure?
Scotty