Thanks, Terry.
Must check out the Hammerheads, and if they are available in Norway. In my experiance, it is the nock end that cracks. Inserts get loose, and creeps out, but the nocks shoots out, and leaves the shaft cracked. Collars helps, but not all the way. I know that the perfect, unbreakable arrow does not exist, and that is not what I expected to find in this thread. Just wanted to find the closest recipe for an arrow that can take the beating of stumping in hostile environments. Seems that the conclusion will be a Hammerhead shaft, footed with aluminium and with a steel collar in the nock end would be the closest to the perfect stumping arrow you can get. That said, this will be continued as the quest for the "perfect" and almost indestructable arrow goes on...