Hello; I have been playing for25+ years and have only recently learned that a "great trumpet" does not work for every player. There are so many variables, such as, bore size, mouthpiece, mass, shape of the slides, weight of the horn, ... One thing I have discovered is that a larger bore size does not mean more air than a smaller bore size. I have a .459 Bach that makes me feel like I am blowing through a straw compared to my vintage King that is easier to play with a smaller bore size, while requiring MORE breaths. I have been considering a custom tuning slide, that is less squared and more rounded, for the Bach, because it is a good quality instrument and has a nice church sound. But there is no guarantee that the "straw" air flow will disappear. Anyone who can elaborate on similar problems is appreciated here. My Bach is much heavier and has a larger bell size than my King. I read somewhere that a smaller bell will cause the sound to "reflect" back faster, causing a quicker and perhaps "easier" response. I do not know what to believe. There is also the reverse lead pipe set ups on some horns. What I have been told by some of my friends is that I need to figure out where I like the resistance in a horn and look for the one closest to these needs. Simple? Not.