I've used Rainiers in 9mm, .38 Super, .40, 10mm, .45acp. .45 Colt with mostly great results.
The .451" 200 grain SWC is particularly accurate in a USP .45 and my .45 Colt carbine.
Only my stock Glock 10mm barrel had trouble achieving top accuracy, but the KKM .40 conversion barrel in the same gun did not. (same results with Berry's)
Glock 29 w/KKM .40 conversion, Rainier 165 FP, offhand at 25 yards. (pretty sure the flier is my fault)