Identification of WW2 Shell Casing

Hello,

Can someone please help me learn more about this? I cannot find out anything about KTC or the Lot 3 3 W S either. I am very interested to learn more about where this came from. Please any and all information about this is welcome. I can post more pictures if needed. The casing is about a foot long.

Found on a beach in Charleston SC

Thank you

3IN MK5 case, made by KTC month 9 of 1943

Found more info

From this


This is what it is most likely for
https://www.ussslater.org/tour/weapons/k-gun/k-gun.html

Yes perfect. Thank you. Any insight onto what KTC was? I cannot find anything about it

maybe one of these


or
Keesler Training Center ( KTC ).

Could be this, but it seems they just made PPE during WW2
https://www.ktcexport.com/Industrial%20Goods/about_us.html

This “KTC” stand for Kramer Trenton Company, Trenton, New Jersey. Their main products were refrigeration coils, heaters, radiators, &c.

Regards,

Fede

Fede FTW