I just took in some bullets on trade--projectiles anyway. They are x-treme copper plated 255 grain FPs. Diameter is .451. Trouble is, I can't find any load data for these(at least for titegroup, which is what i have 7 lbs of on hand). I realize that 255 is pretty heavy for 45 acp, but I would think I can get these to work. I regularly load the same bullet in 230gr RN over 4.6 grains of titegroup, 1.26 oal. This load functions flawlessly in my SR 1911 as well as my hi-point 45. Now I know that in general, heavier bullets should get less powder. Given this, shouldn't I be able to back the powder off by 10-20%(255-230 = 25 or 10 % of 255) or so and start from there? Just looking for a double-check of my logic here, or an opinion from someone that has loaded 255 FPs with titegroup for 45 acp. Thanks!