Juan Bizama had the following podium finishes at major championships: 2nd in the 1951 Pan American Games 50 m rifle 3 positions team (with the non-Olympians Vicente Herrera, Gustavo Rojas, Julio Arriagada, and Miguel Niño), 3rd in the 1951 Pan American Games army rifle 3 positions team (with the non-Olympians Vicente Herrera, Gustavo Rojas, Alfredo Urrutia, and Pedro Jara), 3rd in the 1951 Pan American Games army rifle standing team (with the non-Olympians Vicente Herrera, Alfredo Urrutia, and Pedro Jara).