Hmmm....interesting alternative approach.
It takes me so long to fill the tubes even when using all my tricks to minimize movements, that I have considered timing 100-150 rounds loaded just dropping cases from a bin into the top of the casefeeder to see whether that increases my NET production rate.
An honest production rate, where I start the timer when I pick up the package of primers, fill the primer tubes, then include loading the case tubes, is between 300 and 400 rounds per hour. I also include the time spend swapping out the case tubes. Takes me 2 minutes per 50 cases, so there you have .2 of an hour at 300 rounds spent just feeding the Hulme case feeder, and 16 minutes to get 400 done.
I'm pretty sure that everyone who ever got a full 600 rounds per hour of of a Star had a second person filling case tubes and primer tubes for them. Even if you have the kids doing it for you, that doesn't quite count in my book.