RE: Best Primers
In my earliest years of handloading about all we could get or would see was CCI primers. They have worked well for me for 37 years.
small rifle primers - CCI BR-4
large rifle primers - CCI200
large rifle magnum - Federal Gold Medal match 215 (bought couple of bricks of them at $20 per)
What little bit I have used of the others leads me to believe that primersor I should say using different ones has the absolute least to do with accuracy. Far down on the list from barrel quality, gun set up and overall consistency in loading.