Generally:
Based on my firearms and experiences.
45 ACP is .451 jacketed bullets and .452 lead bullets. .452 may work, depends on firearm.
45 Colt is .452 jacketed bullets and .453 or .454 lead bullets. .451 may work depends on firearm.
44 Old Army, New Army, Navy, etc black powder revolvers use .4515 to .457 depending on: using ball, type conical, firearm, and manufacturer.
.45 Single shot muzzle loading pistols like Colonial, Kentucky, Trapper, etc. again depends on type: smooth bore or rifled bore, type/ period, firearm, and manufacturer. Whether if using a patch, wad, or card, with round ball(s), or type conical, and barrel length. Generally the use .440 to .4475 diameter projectiles.
.45 rifles using patch and round ball(s) use .440 and .445 diameter ball. Mini and maxi balls (conical bullets) are .445 to .454. Depending on smooth bore or rifled bore, firearm, and manufacturer.