Stan;
With all due respect that's not the way, I read it. When this phenomenon first began appearing many "Suspected" detonation. It was ultimately "Proven" that it was not a detonation, but indeed was a pressure spike from an obstruction, the bullet being fired is the obstruction.
The only difference in this from sticking the muzzle of a shotgun in the mud & firing it, thus blowing the end of the barrel off is in the latter case the powder has all been burned, though the gas is still expanding. In the case of the rifle, it occurs so near the breech that the powder is still burning as well as the gas expanding. In Neither case though does a detonation occur.
I simply Refuse to use the Wrong term when I "KNOW" it is wrong as that only serves to propagate the Error..