David Schiaffino had the following podium finishes at major championships: 1st in the 1951 Pan American Games 50 m rifle 3 positions team (with Julio Nolasco and the non-Olympians Fernando Potente, Oscar Olmos, and Rubén Longhi), 1st in the 1951 Pan American Games 300 m high power rifle 3 positions team (with Juan Martino, Julio Nolasco, Pablo Cagnasso, and the non-Olympian Pablo Pedotti), 1st in the 1951 Pan American Games army rifle 3 positions team (with Pablo Cagnasso, Antonio Ando, Abel Ortíz, and the non-Olympian Ramón Hagen), 2nd in the 1963 Pan American Games 300 m high power rifle 3 positions team (with the non-Olympians Ricardo Villordo, Darío Delmenico, and Antonio Ando, Jr.), 3rd in the 1951 Pan American Games 300 m high power rifle 3 positions.