your 45 colt factory load (winchester) is 7 grains of 231 under a 255 grain lead- what you're loading is a 230 , so you can expect it to shoot way low( i found this out the hard way) in the casull, and the 10 grains is a maximum load in a 45 colt, meant only for the rugers and t/cs , but in the casull, you'll see no problems- think of it kind of like a 45 colt magnum, and you're shooting specials