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I use that auto prime too and when i seat a primer, I then turn the brass a half turn and press it again to make sure its uniformre: priming
My Lee Anniversary Kit came with the auto-prime (swinging arm that drops the primer).
Since I like to clean the primer pockets immediately after resizing, I've found combining case expanding with the auto primer makes a lot of sense and saves time.
I had heard mixed reviews about this primer method, but out of 200 I had only1 that did not seat correctly. That was likely a brass or operator error
Maybe I should/could be more anal about my powder measure (weigh every 5 or 10), but I can now crank out 25 .357 rounds in under 20 minutes on my single stage setup. I might monkey around getting the bullet seat depth and/or crimp dialed in when I first put the dies in, but seem to crank there after.