Subsonic is not designed to work a semiauto action, not enough recoil or back pressure. Even with it's limited effective range, always make sure of what lies BEHIND the target.
Also many niche cartridges have bullets of a style or weight that don't stabilize well in regular .22LR rifling. Neither Colibri/Super Colibri (very light bullets), .22 Short (also light bullets), or .22 SSS 'Sniper Sub Sonic (very long heavy bullets - 60 grains) will normally be stable, leading to lousy accuracy downrange due to "keyholing". Up close they do well. The .22SSS by Aguila is pretty quiet (uses a .22Short case), and will operate certain fairly 'soft action' semi autos. My old 1950s Witney Wolverine semi auto pistol loves it, my 2000ish Browning Buckmark won't cycle. It does superbly dispatching small furry varmints within 25 yards.