The bearing surface of the 45 Colt is approximately 15% more than the bearing surface of the 44 mag, thus the Colt 45 is acting against more friction with the contact of the interior of the bore than the 44 mag. How much does that off-set the 10% larger surface area for pressure to act on of the rear of the 45 Colt bullet?
Negligible. Peak chamber pressure generally occurs about the time the bullet breaks neck tension and jumps to the lands. As the bullet moves down the bore the volume of the combustion area is rapidly increasing with a corresponding decrease in pressure. Generally every time the combustion volume behind the bullet doubles the pressure is cut in half.
Forgive me my nonsense, as I also forgive the nonsense of those that think they talk sense. Robert Frost
