I have one of each,,,,,,,,,,,and I can reload the .45-70 just almost as fast as I can the -06. I'm pushin a 20-1 soft cast 530 grainer at almost 1500fps over FFG. One a these days, I'm gonna go out to the feedyard and talk em out of a dead steer then shoot that sucker full a holes just to see what the terminal performance is.
I would really like to see how a PRB compares to a 400 or 500 gr conical in the actual carcass terminal performance. I would guess that it will tell a different story than the charts do.
Now, who's going to come with me to help cut that stinky old critter up for the post mortem? Might need a witness to document the trajectories.