I have started a similar project with a LBT LFN. Veral Smith as a standard mold in his catalog, a 230 grain LFN for the 45 acp. I also have a second mold which is a 250 grain of the same design which was purchased on Veral's last sale but I have not loaded many of these at this time. The first mold casts at 239 with my alloy and I load these for a Smith 625 and USFA with 45 acp cylinder. These are seated to just cover the single crimp grove in acp case and are taper crimped so that they can not be push back into the case. I would like to try a WFN of 230 to 240 grains with a crimp grove and the auto rim case. The WFN would likely give a larger powder space. Thus far I have only use lighter loads of bullseye or 231 for velocities in the range of 750 fps. The difficulty I find is that loading data for cast bullets of 240 grains or more is very limited. I would like to know what some of the actual measured pressures are on the loads that exceed 850 fps. Straight wall pistol cases do not give high pressure signs like bottle neck rifle cases. Once high pressure sign show up I think safe pressure have been passed by a large margin.