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Loading Data & Reloading Procedures / Re: Primer seating problerm
« on: June 04, 2020, 08:20:45 am »
When you changed your tool head, I assume you also changed your shell plate. It could be that you didn't bring down the shell plate thrust nut as far as it was with the previous setup. If there is more slack in the shell plate the primer seating depth won't be the same.
Primer depth is controlled by three factors. Adjustment of the primer punch push rod, slack in the shell plate, and the added force of the expander pushing down on the case mouth. When I set up a machine, I start by adjusting the shell plate thrust nut so there is just a slight rock in the shell plate, but it turns freely. Then I back off the expander so it's not part of the equation. Then I adjust the primer punch push rod to get the proper primer seating depth, then I adjust the expander to get the desired amount of case mount flair. I you follow this procedure you should be able to change calibers without having to re-adjust the primer seating depth.
Bruce Williams
Primer depth is controlled by three factors. Adjustment of the primer punch push rod, slack in the shell plate, and the added force of the expander pushing down on the case mouth. When I set up a machine, I start by adjusting the shell plate thrust nut so there is just a slight rock in the shell plate, but it turns freely. Then I back off the expander so it's not part of the equation. Then I adjust the primer punch push rod to get the proper primer seating depth, then I adjust the expander to get the desired amount of case mount flair. I you follow this procedure you should be able to change calibers without having to re-adjust the primer seating depth.
Bruce Williams