✅ SOLVED Help identify this bullet casing and weird key?

[cabnfvr]

Can anyone tell me what kind of key this is? And what kind of shell casing this is?

 

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[cabnfvr]

The casing has a U 4 2 on it, looks copper instead of brass

 

[ARC]

Oil filter key.

 

[Charlie P. (NY)]

.30-06, .45 ACP or a .50 BMG? It was made in the Utah arsenal in 1942.

Case length, head diameter, and any kind of other dimensions would help immeasurably.

 

[cabnfvr]

It's 4.5 cm long and 12mm wide

 

[cabnfvr]

Thank you! I'm new to this so bear with me, I found what I thought was a tin for percussion caps, got home cleaned it up and it was a condom tin...yeah that's the kinda day I've had! Thanks for your help!

 

[Charlie P. (NY)]

.30 M-1 Carbine.

 

[sutphin]

THE ONE OBJECT LOOKS LIKE A BROKEN SODA POP OPENER FOR A MACHINE .