I used to work for a major manufacturer (CIL) that made millions of rounds of ammo a week.
I recall that a lot of attention was paid to getting high quality brass, because poor brass could cause the entire run of ammo to get scraped if it was seamy, had inclusions or otherwise bad brass.
I don't ever recall anyone ever mentioning "reloading". All the attention was on the first shot.
Brass from different manufactures is different. Some is better than others in terms of softness, annealing, weight variations, neck thickness, etc.
And brass changes from time to time. Winchester went from a 4 draw process to 5 draw (308Win) and the result was 2 different cases that looked identical.
At a minimum, you want brass all either new, or fired once and all from the same lot number.
I recall that a lot of attention was paid to getting high quality brass, because poor brass could cause the entire run of ammo to get scraped if it was seamy, had inclusions or otherwise bad brass.
I don't ever recall anyone ever mentioning "reloading". All the attention was on the first shot.
Brass from different manufactures is different. Some is better than others in terms of softness, annealing, weight variations, neck thickness, etc.
And brass changes from time to time. Winchester went from a 4 draw process to 5 draw (308Win) and the result was 2 different cases that looked identical.
At a minimum, you want brass all either new, or fired once and all from the same lot number.