JSP EXACT JUMBO DIABOLO 22 CAL 15.89 GR. Weighing in between 15.7 and 16.1

Hey guys new PCP owner here. I am an avid reloader and so I tend to be very picky. I have some tins of JSP EXACT JUMBO DIABOLO 22 CAL 15.89 GR. pellets. I am going through and picking out the deformed ones and am weighing them. I am coming up with quit a spread and maybe for pellets this is normal. So far after going through a 100 I have a spread of 15.7 through 16.1. Granted most fall in the 15.8 and 15.9 weights. Is this normal throughout the manufacturers?