I have *heard* the USP is Super-rated. I imagine that is assuming fresh springs, which I have a tendency to refresh pretty often anyway. If I were to replace the springs, I would think about a pound or two heavier than normal if a steady diet is anticipated.
A 255 hardcast at 925 fps is a penetrating mo-fo, and Underwood uses a good bullet. As far as Super, I am leaning more and more to the Missouri Bullet Company PinBuster at 1050 fps for a variety of reasons, cost and accuracy being two.
I have one Rowland in 1911, waiting on a kit for a Glock 21, and I've established a load I like in the 1911 using a Hunters Supply 275 at about 1075 fps.
I wouldn't hesitate to use either load you mentioned for pig medicine. I believe either one will knock the oink right out of them.
