I've been playing my 1960 Mirafone Siegfried gold-brass double horn for 50 years. After a few years in drum & bugle corps in my misspent youth, I tend to put a lot of air thru the horn when the dynamics are fortissimo, and sometimes the tone turns harsh and screechy when I do. I'm obviously overblowing, something a good horn player would never do, but I'm not so good. I understand that a "large bore" horn doesn't have larger tubing thru most of the horn. But it has a somewhat more rapid expansion for the last few feet into the bell. I've heard that a "large bore" horn can handle more volume or power than a medium-bore without shredding the tone so much - anybody know if this is true? Can anybody give me some examples of a "large bore" or "very large bore" French horn? Is the Conn 8D one such? Any others?