Time to stir the pot some....Just for the sake of good discussion! I've got to believe the 45Colt comes closer to being a 454 than the 45 Win Mag. Even though published data with pressure tests are 40,000CUP for the Win Mag and only 30,000CUP for the Colt, the extra case volume at less pressure produces more velocity....i.e. Hodgdon shows the following:
45 Win Mag 260gr Bullet...25.0gr H110...37,400CUP....1339fps
45Colt 260gr Bullet...24.0gr H110...30,100CUP....1374fps
The above data IS listed as MAXIMUM loads and the Colt data is for Ruger, Contender and Freedom Arms ONLY!!! Granted the Colt data is for a 7" barrel and the Win Mag only 5". The Win Mag pressure tested data(Hodgdon) stops at 260gr while the Colt data goes to 360gr. Note that the Colt can do over 1200fps with 335gr bullets and well over 1100fps with the 360gr. Now boys and girls, to my way of thinkin', when you put that in a closed breech 14" barrel...you got yourself a HAMMER!!!