I dont anneal most of my cases but there are a few that I do like my 338. I dont know that it is actually doing me any good because the rifle shoots unbelievably good however, I know some people have seen accuracy increase from the process. I do it to stress relieve my brass even though i only neck size with a bushing die. and occasionally bump the shoulder back but mostly to help keep a level of uniformity throughout a lot (usually 50 at a time) of ammo I have loaded. I have not proven any of this but it is my understanding and makes sense in theory that if you anneal your cases every X amount of reloads that you will maintain a more even amount of neck tension on the bullet which will obviously should lead to a smaller ES in velocity and a more uniform result from round to round. I was just wondering what some of you guys think about this. Also if it were possible to measure neck tension of a given case would it make sense that if you were to sort by neck tension along with your weight sorting and everything else you may or may not do when choosing brass that those sorted groups would be more accurate than the non sorted groups? The question how is tension measured?mathematically by projectile diameter and sized case mouth diameter and wall thickness and material hardness or ducktability? Or am I over thinking this? I am pretty sure that choosing premium brass like lapua and sorting by weight and neck thickness then sizing with a bushing die along with annealing is probably about as uniform as you can get short of neck turning?