Has anyone ever seen an “L” marking between the flash holes on the inside of a .303 case?
I found this marking yesterday on a case headstamped “GB 56 7”. The round itself is nothing out of the ordinary, a standard mark 7 ball round with a GM jacket and lead core.
This means there is possibly a previously unkonwn manufacturer of .303 cases. Any information or possible thoughts on who the manufacturercould be would be welcome.