All this, to gain, at best 20 friggin' yards on MPBR.

Last time I checked, the standard .45-70 and .45-90 BP loads did one HELLUVA job killing critters up through the size of grizzly and bison, at MUCH lower pressures and velocities, but the shooters then didn't have their heads up their collective asses, used heavy, high BC bullets, and used the damned sights calibrated to the trajectory.

Of course, wtf did they know, right?