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Jacob's statement is a good rule of thumb (if it has a year on it, it's military), but there are some exceptions.
Winchester frequently has sold "white box" ammo to the general public that is stamped in military style.
This is, generally, left over from military production runs (as I understand it).
Also, in years past, some manufacturers (normally European) have stamped a year on their ammo even though it's sold to the general public. In years past, though, I've only seen this from a few German and Czech manufacturers in the years prior to WW II.
"PS: I'm guessing the answer is "no", but let me know if you are aware of any other markings or characteristics on used bullet casings that could provide more information."
Sorry, but the answer is pretty much no.
The shipping crates and individual packs (for military ammo) and the boxes (commercial ammo) often have more extensive information, including the lot number from the manufacturer. If you had the lot number, you could at least get some idea as to where the ammo went after it left the factory. But only if the factory opened it records to you.
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