Klem Wrote:A grain or two either side of SAAMI probably doesn't make a difference to the OOB danger. If the base of a case is unsupported then even a half-load (25K lbs) would blow a hole in brass.
Not disagreeing, but if the failure is happening while still chambered, i.e. it is not OOB at the time of failure, there is still some chamber wall support as soon as the case expands to the diameter of the chamber at its widest point, giving it the necessary support to withstand failure...up until the point that the round is at max (or failure) pressure.
And also, assuming the failure is during OOB, remember the pressure is dissipating with time, so, for sure, by the time the bolt is OOB, the pressure is definitely lower than max. This might very well be 25K, but if you started with a heavier load, then it might be 26K instead of 25K at a lower starting load.
Edit: To me, the more you play around near the documented max load, you are simply increasing the risk of a kaboom relative to working with loads below max. It's a spectrum of risk.