What is this ~

[Gspragge]

I've been asked to identify it -

Hi Can you identify this casing? It is 303 mm high and 44 mm wide at the mouth.Identical to Bofors but very thin base, not heavy like Bofors. American style primer.

(44mm sounds like an outside measurement)

 

[rigby]

It's a russian 45x310R case for AT gun.