Grenades vs mortar shells...this has always troubled me as well. Per Gilkerson, grenades were rarely smooth and often not even perfectly circular, because they didn't need to fit perfectly in the barrel. Mortar shells were more like solid shot in that they were supposed to be well formed and smooth, at least theoretically. Put one in the ground for a few centuries and it might not be so easy. I have what I think is a grenade in my collection, somewhat between the size bigger than a golf ball, but smaller than a tennis ball. It has a very small 1/4" hole and congealed powder inside. It isn't perfectly round, so I assumed grenade. Problem is, most resources claim grenades are larger than mine and with a bigger fuse hole. Hope to someday find a resource that shows other sizes besides what 'Boarders Away' lists.
Another controversy is with the brass grenade launchers. Some sources say that these rifle types were too short and too thin to be effective as launchers and that these guns were more likely for shooting off flares or fireworks.
