Personally, the more I reload, the more I come to the conclusion that (at least for modern high quality bullets, brass, etc.,) many of the things people obsess over in reloading don't actually matter/do anything.
In my experience, your bullet, primer, powder combination has the biggest impact on group size. The right primer is mainly important for velocity consistency. Everything else (e.g. seating depth, primer pocket uniforming, weight sorting brass, volume sorting brass, etc.,) is basically a waste of time, in my experience. That said, maybe some of these things are important for certain bullets types or certain brass. I personally haven't seen it.