The only "cheaper" way to do that, that I know of, is to use Gold Medal Seaters.......that's what I chose. They aren't cheap as far as seaters go, but they aren't $400 either. (they
are very accurate straight line competition dies though.)
RCBS used a similar die minus the mic on top to seat bullets with their rifle bullet feeder........so if you are an inventor you could make a tube loader to feed Gold Medal dies and do the same thing.
That's what I planned to do, but I just don't have time for another project right now, and besides, they are so darned convenient and fast that I don't notice much of a bottleneck in cranking ammo out like before, and my fingers stay healthy.
Besides saving money, I just can't stomach adding a second collator to my bench....it's cluttered enough. I don't understand why RCBS and Hornady thinks everyone has all the room and money in the world. AT least Mr. Bullet Feeder uses ONE collator with conversion kits for pistol and/or rifle. They are great tools, just not cheap.
The one advantage of buying the RCBS or Hornady rifle feeders is that they do it all in one station.....Mr. Bullet feeder needs two stations.
Might mention, that if you use a Gold Medal Seater
fed with a home-made tube setup.....
only one station is needed with that setup.......!