I know that this may not be the most proper way to verify I don't have a double charge or no charge, but I have a dowel rod cut into pieces for each caliber and for each powder I have. After charging all the case I'm going to do, I stick the dowel rod in the case an verify against a line that is on the rod. If the line is where it should be then it's a go. If the line should disappear or be over the the case by a more than it should, then I dump the powder out (in the case of a double charge) and start over.
This is how I do it, but it seems to work and dowel rods are cheap.
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