My first thought was that maybe the other components (powder or primers) are different in the aluminum cased ammo? That would be more believable as a cause for decreased accuracy vs different case material.
With that said, I read through all the posts and none of us seem to really have any REAL knowledge of the differences in these components (volume variance of the brass, component makeup, etc).... so we're all just guessing.
If I had to guess, I'd say it was probably a coincidence. But you never know.
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In God we trust.
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