| I have always thought that the mouthpiece is the most important part of the trumpet. As you go farther toward the bell the equipment means less.
That doesn't mean that the bell is not important, just less important.
That being said; there is a rapid taper in the mouthpiece. I think that the taper has to be in proportion to the length of tubing you are playing. Mr. Shilke has you play a cornet mouthpiece on a piccolo trumpet. Short horn = short taper. As the tubing gets smaller I think the taper needs to change little by little. C trumpet is smaller so C trumpet mouthpiece should be smaller.
This is an educated guess based on stuff I read all over the net. |