LARGE SHELL

[Rockhoppernc]

Looking to id this huge shell. L 4 is all I see.

 

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[Hot zone]

Without measurements it looks like a 50 cal machine gun shell casing
Case length 3.91 "
Neck diam .56"

 

[recondigger]

.50 cal shell I've fired 1000's of them

Dig until your arm falls off

 

[TheCannonballGuy]

Recondigger and Hot Zone are correct. More specifically... it is a US .50-caliber Browning machine-gun casing, made at the Lake City Arsenal in 1944. If you look very closely you will see a letter C about 1/3rd of the way around the casing's base from the L. Normally, on Military bullet-casings the year-of-manufacture is marked as two digits. But in 1944 the Lake City Arsenal OCCASIONALLY used a single 4 instead of 44. Go to the following website and scroll about 40% down the page to see photos of the LC4 (and LC44) headstamps on .50 Browning machine-gun casings.
WWII 50 Caliber Headstamps