Well, I’ve yet to test this against mundane turrets, but mil-spec turrets and tank drones have proven immune to anything I could throw at it.
40mm frag rounds and incendiary rounds have both failed to inflicted even light damage on mil-spec turrets and tank dones. Tank drone also shrugged off the M72 LAW. Debugging for a tankbot main gun? Can’t scratch the mil-spec turrets.
EDIT: Bullets, however, work better it seems. At least, 40mm fletchette seems to be tearing into the tank drone’s armor very well.