It looks like a 75mm Frenchicon field gun shell. These guns were capable of firing 20 rounds per minute with a good gun crew.
I have one shell case that has been engraved and brought home by a french soldier; I assume that he was on the "Chemin des Dames" because the village "Craonne" was wiped out during that campaign.
The head stamps are similar style to your case. The case has a slight neck reduction near the top.
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