That tubular ammo was called PMC Ultramag and was made in .38 special and .44 special. There was a nylon plug behind the bullet. When fired, the lightweight nylon plug dropped away after the tubular bullet left the barrel. Muzzle velocity of the bullet was in the order of 1700 FPS out of a 4" for the .38 special. Seems to me the weight of the bullet was around 66 grains. Most of the gunwriters who tested it felt it was a gimmick and after a couple of years went the way of the Edsel.
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