Yesterday I checked out with my chrono, two boxes of .25-06Rem. ammo. I had loaded . Everything in respect of case prep, the recipe and the bullet was identical except for one thing. One box was several times fired cases and due to be annealed, the other box were anneald cases.
The anneald cases produced an average MV of 3146fps with 28fps ES.
The not yet anneald cases produced an average MV of 3099fps with 32fps ES
The difference in POI @ 100yds was 1.5" (The faster load POI lower than the slower...) I was surprised at that, considering were only talking about 47fps difference between the two loads. Obviously this was just a field test using my Chrony, nevertheless it has provided interesting benchmark data.
I'm of the opinion the anneald cases seal faster and better than the un-anneald ones and so different chamber pressure is generated...just my thought.
Has anyone experienced similar or have any comments? ATB