I only have .45 ACP, .30 Carbine and .223 shellplates for my 550B. It came with the .45 ACP stuff, and I bought the others later. I haven't actually used it for .45s yet. When last used it was for .223, and while a double charge wasn't possible, a "no charge" was. So, after loading up a bunch, I weighed the loaded rounds, two at a time. A loaded round was over 170gr. So, two at a time, if the scale didn't go over 340 every time, I'd know one was missing its powder. 24.8gr is way more than can be accounted for with case variations. Unfortunately, I don't think I can use that method when I set up to do .45 ACP.