I did anneal when back when I did a little case forming years ago
Only when making drastic changes in forming one case from another.
Definitely then.
Although I will admit there are times when reducing body taper or necks some times annealing can work against you. But as a rule usually works especially if done little bit by little bit sizing and annealing. Which there I'm referring to taking like the .357 Maximum case and tuning it into a .221 rimmed version. That one takes a bit of work to say the least.
With the 6mm Ackley Improved which most are aware is my latest focus. That one is great, simply size with the regular parent die, anneal. Load to your known good load for the parent case, fire out comes the Ackley Improved version. The Ackley Improved are in my opinion the absolute easiest way to "wildcat" regardless of the parent case.
I'm 1 or 2 firings than anneal, because by the 3rd I can feel the difference when seating bullets. I anneal for case preservation and seating effort consistency.
Don't see any reason to bother as a regular practice.
I will absolutely agree with both practices. Some folks never use brass beyond 3 firings, some don't.
That should be a individual call, based on desired outcomes. Which is why some say they simply don't anneal unless "wildcatting".
IMHO it is fine to do so, or not do so.
I do anneal but like I stated previously I'm bad to pick up range brass. In my practice it just gets all the brass on a somewhat even "keel". The other aspect I'm always looking at my brass before loading, probably way more than most.
Although I'm not the OP I have thoroughly enjoyed the discussion. Thank you.
Regards
Mike