The effective pressure maximum is 19,000 psi.
16,000 psi will show signs of overpressure.
Depending on the gun...some guns will allow the cases to blow more consistently.
It seems that the newer rifles are designed so that the bottoms of the bolts have a void or open area so the cases when rupturing will blow the gasses downward and out of the face of the shooter.
These modern bolt faces with the thin cases will have case failures at about 18,000 psi.
That is usually equavilent to about 1500 fps with a 40 gn bullet in a 22" rifle barrel.
Overpressure signs start to show up at about 1400 fps in the same situation.
These pictures show some eley cases that were overpressured. The polygonal notch on the head is the area where the bolt face was void. The ones that have bulging but not blown were shooting a 40 gn bullet at 1450 fps which is equavilent to about 16,000 psi.
Edit:
The pressures are estimated from the chronographed velocities and run through Quickload. I have discovered that there are variables which would cause my pressure assumptions to be off.
The velocities for 40gn bullets are correct. But the maximum pressure of 19000 psi is not correct. It appears that as SAMI published maximums...The 1500fps 40 gn bullets are rather pushing 22000+ psi.
Thus the overpressuring signs on these cases are in the 20000 psi range and the blown cases are in the 25000 psi range (estimated).