Let me say first, we all have differing degrees or levels of acceptable accuracy. I have always felt that neck tension consistency has been an ace in the hole. You almost need to anneal for this to come to fruition, but now you have opened another can of worms that takes time and maybe money. You have altered your brass. But we take different paths or use different methods to achieve this, bushings, mandrels, etc...
There is only so much you can do with your powder charge, or seat depths.
I am going to continue to anneal after every firing, that is my standard to work from.
Here is the kicker, about a yr ago, I met a guy at the range, shooting a Bergera H14 in 6 creed. shooting Prime ammo. His combo flat out shot for all factory.
We became friends, his hours matched mine, one outing I told him we could improve his guns accuracy. So we made a load, awesome, Peterson brass from Prime ammo, RL 16, Berger 105 hybrid. Being I do not have AMP pilots for Creedmoor, we cannot anneal. He is on 6 firings of his brass and that rifle shoots beside most all that I own, impressive.
So right now I am questioning the validity of annealing my self. Common sense says that different brands of brass, or different compositions of brass may dictate the actual effectiveness of annealing. If I get a new barrel, I may try not annealing with Lapua brass, but it would not be a fair comparison to compare my Lapua, which is not creed brass, to his Peterson and come to a conclusion.
I know I did this, I hated the feel of neck tension on hydroformed Dasher brass, so I went 3 firings before I annealed, and believe it paid off.
Lol, I guess I really do not know what I am trying to tell you here, other than an experimentation without commitment is not the answer.