Aust issued Drill rounds were generally Nickel plated or painted silver. I have seen flutes on .303, 7.62mm, .50BMG and even up to bigger stuff like the Bofors 40mm Drill round pictured. I have never seen flutes on .380 Revolver or 9mm, but have seen them plain or with drilled holes in the case, which I have also seen on .50BMG.
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