My USP45C is not at all finicky about what it eats, it has acceppted everything I've put in it, it has had no malfunctions of any type to date (just like my SIGs). for Practice, I've found S&B 230 gr hardball to be inexpensive, accurate, reliable and clean. For carry, I favor lighter (165/185/200 gr) projectiles in short barreled .45's I didn't note what caliber, so I don't know if my advice is real useful. FWIW, I use a l0ot of S&B in 9mm, too, same performance.
M2