I am not able to find any load data on that exact combination. Any advice on where to look, or any recommendations on a starting load and OAL? Do any of the reloading guides publish this combination? FYI, I have looked for internet load data including on Speer's site and in the Vihtavuori Reloading Guide 2021. The closest bullet I can find list in the VV guide for 9mm 115gr using N320 is Extreme RN HPCB which recommends starting at 3.9gr and 1.142" OAL. Is this bullet close enough to the Speer 4712?