You are suffering from information overload. I suggest that you return to the roots. Much of what you read on this and other forums is unnecessary. If you were happy with your results, don't change a thing. Don't overthink things.
Don't worry about expander balls, specialty dies or some "magic technique".
** some won't appreciate but......my wife polishes my expander balls. **
Unless you're involved in some sort of target shooting, or long-range hunting, that requires the finest accuracy possible, then most of the precision stuff is irrelevant.
About half of what people do in the name of extra precision is wasted effort.
Well, slap my Grandma !
I've been a member here since 2010 and IF I've ever read things like these ABOVE... I don't remember.
I have ALMOST quit reading some types of 'threads'. I just don't have any interest in them.
I've been 'handloading' since 1974 and I NEVER missed a deer because of A HANDLOAD. Certainly I've missed some deer but NOT because of insufficient or incorrect handloading procedures.
You guys have almost restored my interest and confidence ! ! !
Thank You
Jerry