German WWI Artillery shell casings brass and steel Identification Help - ORDNANCE - U.S. Militaria Forum

Hello and thanks for taking time to read this, I have two artillery casings, one brass and one steel that appear to be the same size, can anyone confirm that caliber? 77mm? Too, did Germany resort to steel late in the war? Thank you!

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Artillery shell cases, fuzes, primers and tubes. – Stephen Taylor