4.2grs of Titegrouo was my original load for my Beretta 92; I didn't have any signs of over pressure. I have since dropped it down to 4.0grs and it cycles just fine and I shoot it a bit better. I find it is a bit dirty; the cases come out dirty compared to factory. Pistol doesn't seem to gunk up all that much.
I never thought I was getting over pressure signs in the past 'cause I made up 500rnds at 4.2gr but I just happened to check some brass I picked up from my last range session. Unless I happened to have picked up someone elses brass with mine. I've got about 150rnds left of my 4.2gr loads so I'll check 'em next range session.