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I would say the shells definitely ARE mortar shells and a cannon shell. The 55 S 55 is muzzle loaded and both types of ammunition have a straight cylindrical hind section that goes into the barrel; they are also not easy to stand on their tails. My recollection is that the "practice barrel" was in a smaller caliber than 7.62x53R (the Finnish version of the Russian 7.62x54R). The practice round was a .30 tracer with similar ballistics to the recoilless round (i.e., subsonic), so the full-size cartridge case would have way too much powder room.It may have been 7.62x39, but even 7.62 Tokarev (similar to 7.63x25 Mauser; both are necked pistol rounds) is possible. --Death Bredon (talk) 21:09, 5 April 2013 (UTC)[reply]