I used 5 different types of brass in a 308 and still achieved a single hole group. But in saying that, it was a custom rifle and shot that with any load except factory rounds which struggled to hit a barn door. I even used cases with split necks and they still grouped perfectly.
But now I stick to the same make of cases most of the time.
If you can use one make of brass then that's the way to go.
Every rifle is different and some like certain types of brass.
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