A member of the document storage site "scribd" has posted 50 interesting artillery documents on the site. Some are modern so close your eyes and press "exit" immediately when you find one of those of course, but many are fine, obscure, ancient things such as Kriegbuch at this link. Sorry I know you despise links but this stuff is far too voluminous to copy here. Kregbuch has my hackbutt on pp. 50-51. I had not seen an Hackbutt projectile mould before but apparently there is one pictured on same page.
http://www.scribd.com/doc/102080952/Krieg-Buch
Now here's the link to his index of other items on Scribd, incl much on Mons Meg.
http://www.scribd.com/cbirdseye