I have been loading most of my own ammunition since 1976 when I worked at a Sporting Goods store in Houston named Glen Slade's. I was shooting .250 groups at 100 with a 22-250 and 6mm Remington, both in Remington 788s that I had taken the triggers apart, polished everything and bedded them. Back then I used Lee Target loaders and a leather mallet which were very simple but made good accurate loads. South of Houston was Bailey's House of Guns which was where I did most of my shooting. RCBS was a primary die company and I think Sinclair was around then but I'm not sure. Bullets were nowhere near what they are today, same with powders and brass was usually either Winchester or Remington. I have an old Speer loading manual which is not really relevant today because powder formulation has changed even within the same manufacturer and powder type. IMR 3031 is not the same as it was fifty years ago. I've been in LE for 42 years, part of which was as a sniper, I attended the FBI Sniper / Observer school in 2004 etc, so I have some background in the shooting world, and reloading for nearly fifty years should have taught me a few things. I also have a small gunsmithing business I do when I'm not working for the County and at 70 years old I still put on my uniform every day and go to work. As long as I can constructively contribute and not become a liability, I will continue to work. As I age I am ever evaluating myself and my ability to engage when called upon effectively, When I'm not confident about that, I'll retire. And shoot more.
There is no doubt that more accurate modern machining produces better components and more precise components should make more consistent and better loads which is always a good goal to work toward. That was the essence of my original question about current high quality dies, recognizing that there are many on this forum who have much more experience than I do, maybe not many doing it longer but certainly more experience especially with more current tools ie dies, presses etc. I wish to avail myself of their knowledge and experience.