Ya, that's my mistake. They have SAV .303 not the other way around.
For the record I have the following with SAV .303 on the barrel ahead of receiver...
181XX 1899C
218XX 1899B
488XX 1899B
802XX 1899B
990XX 1899B
1188XX 1899B
I have 133XX in 1899B without a barrel address ahead of the receiver.
