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Went back and checked Speer Manual #14, and am pretty sure they only go up to 230gn.
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You are correct I checked my speer #14, it ends at 230 grain bullets.
My speer #12 & #13 lists a bullet "45 Mag-JHP" 260 grains, it appears that both the 12 & 13 manuals contain the same recipe data for the 260 grain bullet. I would note that this is the data I used when the book was new; I tried this bullet and found it to be pretty hard on the mechanical stop of the slide.