What caliber is this?

[CobraMike]

Does anyone know what caliber this is? Buddy of mine works at a scrap yard and found this. It says SL 44 around the primer. I googled it and found it was manufactured at the St. Louis ordinance plant in 1944 but that's about it.

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[lx1x]

20mm volcan?

 

[SCARCQB]

Oerlikon 20mm

 

[lx1x]

http://www.conjay.com/Ammunition for Armor Testing NATO General and 20mm.htm

 

[CobraMike]

Well that didn't take long. Thanks for the info!

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[SCARCQB]

Lx1x uses that caliber for hunting squirrels.

 

[lx1x]

Lx1x uses that caliber for hunting squirrels.