Klaus Leibnitz was kind enough to give me permission to post this paper on gun arrows.
Try this one
A precis: Arrows have been associated with early cannon. In fact the earliest pictorial representation of a cannon (fro the Milimet Manuscript) shows one loaded in/being projected from such a weapon.
There has been some discussion in print, in the Journal of the Ordnance Society, as to the original function of some large arrows found in an excavation in Germany. This paper discusses the question of whether such projectiles can be considered unequivically to be associated with cannon.
A good read by a notable scholar.