I donít want to open the Pandoraís Box of the trumpet world. However whilst I was practicing yesterday (I normally work on the high end of my range every other day)
I did a simple test with my mouthpiece. I inserted the mouthpiece normally and then rotated it to get a feel for how freely it moved. I then played some scales up to the top of my range and then tried to rotate the mouthpiece again, and surprisingly it rotated much the same as when I first inserted it.
I then gave the mouthpiece a slight tap with the palm of my hand and noted that the mouthpiece would not rotate and required some twisting to remove it.
I no this isnít very scientific, however I will try to get an approximation of the force I exerted on the mouthpiece when I gave it a tap.
Anyway I thought it maybe a simple check to use on the trumpet just to see if the mouthpiece has been forced further up its taper after a good workout.