This isn't meant to give anyone a hard time but I have to ask. Why go to all the trouble of loading black powder in your 45 Colt cases, lube your bullets with the correct BP lubricant, and then use a totally in-appropriate and non-traditional bullet weight and configuration?
The standard bullet weight for the 45 Colt for many years, going back to 1873, was either 250g or 255g RNFP. Yes there were light gallery loads (often just a round ball pushed down in a case) and the military wimped out with the 45 S&W's 230g bullet. But if you walked into the local mercantile and asked for a box of "45 Colt's" you would either get 250g bullets from UMC (and later REM-UMC) or 255g bullets from Winchester.
Dave
PS: Firing a fully loaded (35-36g of FFFg - to make up for the reduced internal case capacity of modern brass) behind a soft cast 255g RNFP is an experience to be remembered. Hitting a steel gong 10 or 15 yards out with this load from a 7-1/2" single action revolver will put a smile on your face that will be there for some time.