Alot depends on how you calculate your rate, and how they calculate their rate. I feel the published numbers are optimistic and do not include set up time, restocking time, and shut down time.
For instance, Dillon published a cyclic rate on the 550B as 550 rounds per hour and an hourly rate of 500 rounds per hour. It takes me 2 to three minutes to fill a primer tube, so at 550 rounds per hour cyclic rate, that would be 10 plus minutes to re-supply the primer system. So, i lose 10 minutes per hour of production so the rate is now 460/hour. That does not include other delays in production.
For me, I can load 500 rounds in an evening, but the actual time of stroking the press is about an hour or a bit more (note, it is not a 500B, but calculation methods are similar). The rest of the time is setting up and putting away. So, cyclic rate is about 500/hour, but my average rate is more like 150-200 rounds per hour.
There are things I could to to improve on those numbers but it is money for more equipment that I am not willing to spend at this time. My rates are adequate for my needs.
I am sure with time you will get faster as the process gets more familiar.
A case feeder will add speed, but also complexity
Hope this makes sense.