Your press isn't going to be "accurate", it's just a tool to push cases into and draw them back out so the ram slop you cite is trivial and meaningless. It's dies, components, load development and user skill that produces high quality ammo. When you have made up maybe 2-4 thousand rounds while experimenting with your methods and loads you MIGHT be ready to go to the high grade dies by Forster or Redding. Until then standard dies will do all you'll need - after all, they're all pretty good!
BR shooters don't normally use threaded dies or presses. They use 'hand' dies and arbor presses and you can't find a looser press than that!
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