Both, Glenn. The hollows have the plug in them(or the hole for it) that, and as you said, the hollows weigh Far less than a solid of the same diameter would-even when still packing explosive. Rather hard job getting in the charge After they had been welded shut(the 2 halves being joined). A person would have to be a mud head to not notice the difference and use still loaded explosive balls to make such a thing.
But...Having said that, I do remember a CW display in a town square here in the States that had Welded a stack of balls together to make a nice display by a cannon, only to notice many many years later, that they had never been Emptied...How in the World they somehow had succeeded in applying a Welding torch to an explosive shell (Several, actually) and not gone up to meet the clouds, is a mystery! Sometimes you get Lucky...sometimes you make fireplace guards and get Unlucky....
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