Kees,
Welcome to my world. You sound like I do.
I have started selling off some of my collection of powder horns. I am probably down to 40 by now. I only have one horn for sale right now, a nice banded applied tip by Steve Vance. It is listed here on our trade blanket. Sure would like to part with it even if it is a really nice horn.
I have already culled my gun collection down quite a bit, but I just cannot bear to see the revolvers go, both B/P and cartridge. Maybe one day. Then there are knives, oh boy, what a quandary.
John