Mine's nearly 30 years old now (1980), made before they started putting plastic parts in the action, but I shoot pretty much anything in it.
Mini-mags, Velocitors, Remington subsonics, Federal bulk, Aguila Subsonic Sniper, CCI CB shorts (load 'em single shot), and about anything else I have or get.
It seems to shoot the Rem Subsonics the most accurate, with mini-mags being a close second.
Daryl