I would clean the dies and inspect to make sure no visible damage (borescope is helpful if you have one). Make sure there is no tumbling media/dust on the cases prior to lubing.
Use a good lube and the proper amount
Something I think some may overlook ....I would also inspect and clean your shell holder ... I have noticed sometimes grime, corn cob media, etc can build up inside where the rim gets aligned in the shell holder. If the case can't align properly it might not go into die straight and cause some scratching.
Some reloaders are more cleanly than others, or sometimes we get in a hurry. As a general practice, I try to always start with a cleaning and inspection of Everything before I start the process to eliminate any issues and make sure things are set up correctly.
Use a good lube and the proper amount
Something I think some may overlook ....I would also inspect and clean your shell holder ... I have noticed sometimes grime, corn cob media, etc can build up inside where the rim gets aligned in the shell holder. If the case can't align properly it might not go into die straight and cause some scratching.
Some reloaders are more cleanly than others, or sometimes we get in a hurry. As a general practice, I try to always start with a cleaning and inspection of Everything before I start the process to eliminate any issues and make sure things are set up correctly.