1)
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brass should have very little effect on the outcome of your loads, especially in a pistol round like 9mm
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IME the .355" bores are the most affected by varied headstamp. However, I completely agree that many barrels don't care.
I have one 9x19 barrel that DOES NOT CARE. It gets fed mixed cases (back to that "lazy" thing).
I also note that subsequent firing of new brass cannot duplicate the performance of new brass.
2)
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Nickeled brass in .38 Spl. and .357 Magnum will have significantly shorter case life
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First, case life is mostly determined by the chamber it's fired from, and the load in the case.
Process is another significant factor for case life. I'm still reloading used nickeled 357 Magnum I bought used in 1976.
Lastly)
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three kinds of cases:
-New
-Once fired
-More than once fired
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This. Truth.