At what distance were you shooting?
What size were your groups with the brass cased ammo, how many rounds per group, and how many groups did you shoot?
What size were your groups with the aluminum cased ammo, how many rounds per group, and how many groups did you shoot?
In the real world, it's very unlikely that either you or your pistol are accurate enough to discern any differences in case material.
If you were to fire pure gold cased ammo that cost $10,000 per shot, it would probably "seem" more accurate than either brass or aluminum.
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