gentlemen, i have a 1998 USP .45 that has now reached:
28,150 .45 ACP
9,335 .45 ACP +P (specifically a mix of 185gr golden sabers and 200gr speer)
2,000 .45 Super (mix of 230 and 250 gr, not sure the exactly split but a lot of starline homebrew and winchester loads with like a box of buffalo bore thrown in)
100 rounds of .460 Rowland
original recoil spring, although i have a spare one. just started getting inconsistent ejection on my usual loads (.45 +p 200gr underwood JHP's) so new recoil spring time it is. after detail strip, other than being a bit dirty here and there, it's got a lot of life left in the bore and frame. photo is during the take down to illustrate wear a bit.