Mine will throw a bad charge if it is not on a stable surface. I keep it on my table just behind the press. I have noticed vibration causing errors. I need to sit it somewhere else but I have found that if I time things just right the problem can be avoided.
I load, 9mm Luger, 38 and 40 S&W, 38 Special, 357, 45ACP, 45 Colt, 223, 243 and 30-06