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Handgun Reviews Revolvers

Triangular Ammunition?

by Scott E. Mayer   |  May 24th, 2011 8

Q: There used to be a pistol that, instead of firing bullets from conventional cartridges, fired them from triangular, plastic tubes. My buddy doesn’t believe me, and I can’t remember what the gun was called to look it up and show him. Help!—Pat V.

A: The cartridge you describe was called a “tround.” It was invented by David Dardick for his Dardick Series 1100, 1500, and 2000 double-action revolvers. Introduction was at the 1957 NRA Annual Meetings. As you noted, instead of a brass cartridge case, the tround was plastic. It had a conventional primer, powder and bullet. The case shape permitted trounds to be stacked efficiently in a box magazine that was inserted in the pistol grip of the revolver. The trounds fed up into a “cylinder” that had V-shaped notches into which the trounds seated. Guns were available in .38 or .22 caliber and there is some argument as to whether a total of 40 or 50 of the guns were made. The public was never overwhelmed by the tround, nor the Dardick revolver. It is, frankly, an ugly-looking gun. There have, however, been successful applications of tround technology reported in hard rock drilling and military gun applications.–sem

  • Bill Pruett

    Sounds like the Edsel of the revolvers

  • Carlos

    I thought that the ammunition was called a "Tround'? My brother still owns shares in the original Dardick corporation. It was a neat idea, well before its time. I had heard that this concept found a use in a star-wars space mounted weapon?

  • Jules Rabalais

    You are correct. The tround was very slow until the "Rocket Charge" ignited and started to fly. As a close combat weapon tround was zero, but they did make a similar copy for the movie. The firearm was made in San Francisco

    • Scott E. Mayer

      Jules, the "rocket bullet" was a different gun and cartridge for the Gyrojet.

  • Jamie D

    I have been into guns my whole life and this is the first time I have ever seen a tround I heard of it along time ago but never seen one. Nice to actually put a picture with the stories.

  • Antonio

    Wait a minute… double action revolver + box magazine inserted in grip + fed up into the cylinder… this sounds like an early revolver-semi-auto hybrid. And if you think about it, this would be a logical and sequential next step from revolver to semi-automatic. Very interesting.

  • Jay Curry

    I have a Dardick 1500 and am looking for a conversion kit and or ammunition for it. I don,t think it has ever been fired. If anyone has any info please respond at

  • Joe

    Are the shares in tround ammo worth anything??

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