I wonder about the slag part. The cannon in question were rifled so that impurities that changed the cross sectional weight distribution would not be "averaged out" during flight. That would lead to erratic flight.
I would think that the purest of pure material would have been sought after for producing these critters.
I have participated in cannon shoots at Camp Grayling in Michigan, USA where very serious guys shoot black powder cannon. My son was on a team for an 8" siege mortar, unrifled, naturally. The team had their ammo numbered and would load it according to a mark so that it was always loaded the same way. Presumably to account for any impurities. Based on that observation, it seems unlikely to me that slag was used. Is there any documentary evidence to support the use of slag for making projectiles?
Fernando, you could allow us to cut one of your specimens in half so we can be sure.
Picture shows the kid firing the mortar. Really amazing to experience that.
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