Sounds like a great load. I have to admit, in your original post it sounded like you were looking to stop at 2600 FPS and I figured the '54R would do more. 2800 sounds really nice! I wonder what that bullets velocity will be at 300 yards? Just for giggles, there is also that Barnes 110 grainer you could play with, though it, being designed for the 300 Black Out, would be explosive at close range out of your pistol.