Originally Posted by judgecrater
I have tried that. The variation in brass and bullet weight will conceal a double charge.
Agreed. When I had multiple squibs from a batch of 230gr JHP 3.8gr Clays, I weighed all the remaining loaded rounds, found a couple that were well under the avg weight and was sure they were undercharged. I pulled them first and found 3.8gr of Clays in each of them. I then pulled the 100+ other remaining from the batch and found 3.8gr Clays in every one of them.