Help identifying a 1945 brass shell casing - General Ammunition

Hi, My son is a huge fan of tanks and we found a 1945 shell casing and I was hoping you guys might be able to help me find out some information about it for him. Such as who was the manufacturer, what sort of gun would shoot it. Sorry my google searches are not coming up with much. The markings on it are: 25PR Lot 403 1945 RLB I will try and post a picture Thanks in advance, Cheers Amy

Cartridge case terminology and identification – Stephen Taylor

Help identifying a 1945 brass shell casing - General Ammunition

Help with Artillery Shells/Cartridge Identification - ORDNANCE

32 ACP Ammo at : Cheap 32 ACP Ammunition in Bulk

Large calibre markings (The Western Front Museum)

Large calibre markings (The Western Front Museum)

Steel Pennies And Alternative Ammo: A Different .30-06 M2 Ball

British 303 Cartridge Case Identification – Headstamps and Much

artillery shell case

Original Japanese WWII U.S. Soldier “Send Home” Shell Casing

Need help identifying this 3 shell, please (Added information on

Identification Request E .118. V11 - General Ammunition Discussion

Help identifying a 1945 brass shell casing - General Ammunition

Help to identify this shell case? (Canadian manufactured 25

Can anyone ID this WWII era shell? - General Ammunition Discussion