One of my buds and I both have .45 Colt Redhawks.
After learning from various forums and Redhawk owners that .45 Colt Redhawks tend to have undersized throats, we tried the Elmer Keith/Brian Pearce method of trying to push a .452 Cast Performance boolit through the cylinder throats of our guns using finger pressure. Didn't happen. Finger pressure turned into white-knuckle pressure and the front driving band started deforming. It wasn't going to enter the throat without a hammer or a healthy dose of powder.
I have no idea how big the throats are so I have no idea what size pilot I would need. I only know that they are much tighter than a .452 CPB GC bullet.
I recall Snyd telling someone on another thread that some of you folks are passing around a a .452 or .4525 .45 Colt throat reamer.
Soooo........ With my hat in my hand, "How and when may I have a turn? "
Also do Ruger SRH's in .454 Casull also suffer from tight throats?