Do you want to keep track of how many rounds you loaded in a session or even over the course of a week or month? We have these awesome, custom made Dillon round counters that can be in stalled on a Dillon SDB, 550, 650 or 1050. They use a digital gauge attached to the powder measure so the round only increments when powder is dropped.
You can order on our web site: http://fasttoys.net/ca/Dillon-550-65...Round-Counter/
Here's a video where you can see the round counter in action: https://youtu.be/zU01hMZyd0s