....Pressure, in and of itself tells you nothing about a dynamic process....
....Free recoil momentum of the gun an d ejecta total momentum are equal.
DDA
If I am not mistaken, I believe your original comment was that pressure could be related to acceleration. The change in momentum may be more of what is being felt in recoil.
If a static PSI is applied to a metal part, and it is deflected a measurable amount, will the same PSI, applied over a very short duration, deflect the same part to some measurably greater degree because the change in momentum of the deflection can't be stopped instantaneously? An example may be a stubborn bolt responding to a sharp hammer strike rather than a steady pull on a cheater bar.
Back to the original question. Anecdotally, we seem to know that guns can go off face. It seems to happen due to multiple exposures of short duration pressure exposures, and it seems to happen with less repetitions if the pressure is higher.
