Too fast and too small of a bullet. The Colt .44 Walker with a 9 inch barrel had a huge bullet that STOPPED in the target it hit. . . and delivered every single foot/pound of energy it carried to the target with a bullet that was already "pre-expanded" To this day, the .45 Long Colt in the 7 1/2" barrel Single Action Colt has the highest Hatcher Relative Stopping power scale rating of 73, higher than the .44 S&W Magnum's 69 rating from an 8 3/8" barrel model 29. . . because the speed of the bullet means the bullet does not deliver the energy to the target but carries it away with it and hits something beyond the intended target. You want a Mack Truck to hit your target and not leave for parts unknown (like the neighbor's babysitter or your kids on the other side of a sheetrock wall).
High velocity does not necessarily translate to energy delivered. . . since the energy can only be transferred efficiently after the bullet slows to the speed of sound of the medium its moving through. The Colt .45 Long Colt and the .44 black powder loads were already traveling slower than sound speed. . . when they hit, they immediately started delivery of their energy.
I managed the Olde Sacramento Armory for several years and Simms Hardware's Gun department forty years or so ago. . .
My personal carry weapon is a 100 year old Colt SAA. The action is smooth as butter. It comes up exactly on point.