From Westley Richards themselves:

The .425 purchased by Selous was most likely the last rifle ever acquired by him. He wrote a testimonal for Westley Richards on 4th July 1912 stating:

“I can only give your .425 Magazine Rifle the highest praise. Had I only possessed such a rifle in my old elephant hunting days I am sure that I could have killed three or four times as many Elephants as I actually laid low.”

Matt.