I am getting ready to develop a load for a 6" 45 that i am using in Lim 10. It seems all the load data published is for 5" barrels. Using a fasst powder such as Clays, N310 or N320, how much of an increase in velocity should I expect, if any? Want to develop a 170PF using either a 200 or 230 gr. plated/jacketed bullet. Don't have easy access to a chronograph yet and was hoping somebody has already been through this excersize.
Thanks
Mike Wickizer