I, too, was a Trumpet player, and damn good (turned down an awfully good music school to pursue engineering). I had no adlib abilities in jazz band, but marching band solo's were always pre-written, and I had impressive range. Senior year, we played the james bond theme, all of which was above the bar, up to a double G, I think because I was able to pull it off (standing still... I couldn't get up there while trying to march). Did it all with a B-flat (Bach Strad). Also have a 4 valve B-flat and A (interchangeable) piccolo trumpet, and in college marching band, we occasionally played herald trumpets for the traditional intro fanfare to pregame at UC.
Never did get a C horn, because I learned how to transpose in the symphonies on my B-flat, so trying to relearn transposing on a C would be another learning curve I didn't want to take.
Draug, where'd you go to school?