I don't have a mic to measure them with. I know they're 4 gauge, that's all I can tell you.
There are some military hulls I've seen that are paper and very large. Could be what you've got. The ones I've seen had either no markings on the base or just some numbers. I think they're fuse or flare rounds.
DLH
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I was as virtuously given as a gentleman need to be; virtuous enough; swore little; diced not above seven times a week; went to a bawdy-house once in a quarter--of an hour; paid money that I borrowed, three of four times; lived well and in good compass: and now I live out of all order, out of all compass. Falstaff - Henry IV
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