Does anyone have any information on any of these 3 cartidges? I think the 2 shorter ones are Mine Cable Cutters. The longer one may be a bagged powder primer for a large gun. The first two have a lead slug which may or not be original as the ends are rough like badly poured lead. I have an unprimed empty of the shortest one and the case is stepted inside at the point you can see the cannelure just below the mouth. The remainder of the case is at least twice as thick as a normal pistol case. The longest one is an empty case with the same stepped construction inside about 1/8 inch from the mouth and is quite heavy brass. Headstamp on the shortest is “MARK 14 MS” and the entire head is coated with brownish varnish. The one with the red lacquered base is “CUTTER MARK 12 MOD 1”. The longest one has no headstamp,
EDIT INFORMATION: I just found this picture on NRA Auctions (Thanks Iconoclast!!). Now I would like information on the device these were used in.