Help me with the identification of the British proof marks of my new WESTLEY RICHARDS (Confirm or rebated my poor knowledge, please):

http://i105.photobucket.com/albums/m239/hcroveda/DSC00819.jpg

Photo 1: three marks
(left to right)
provisional proof of barrels of the Birmingham Company
Serie’s number of the rifle
Private proof mark of Ketland, Birmingham

http://i105.photobucket.com/albums/m239/hcroveda/DSC00820.jpg

Photo 2:
Between two Private proof mark of Ketland, Birmingham, it’s have the number 38 ???

http://i105.photobucket.com/albums/m239/hcroveda/DSC00821.jpg

Photo 3:
Identification of the cartridge: Express for Nª2 Case or 577-500 Nº2 or .500 Nº2

http://i105.photobucket.com/albums/m239/hcroveda/DSC00822.jpg

Photo 4:
In what year beginning to use this marks?

http://i105.photobucket.com/albums/m239/hcroveda/DSC00823.jpg

Photo 5:
Trade mark and address

http://i105.photobucket.com/albums/m239/hcroveda/DSC00824.jpg

Photo 6:
WM ???
J ???
A ???
/// These marks are repeated in the wood and the action. It’s the gunsmith mark?
83 ??? Could be this the data of production of the rifle or action -1883-?

http://i105.photobucket.com/albums/m239/hcroveda/DSC00827.jpg

Photo 7:
2 ¾ cartridge lengh?
Power 40 ??? This is difficult to read, do you thing that said power or other word? 40 it’s the weigh of power for what caliber? Not for 577-500 Nª2

http://i105.photobucket.com/albums/m239/hcroveda/DSC00829.jpg

Photo 8:
P
W in only one mark (not separated), it’s repeated in two parts of the gun??
2

Below it’s N ???

Thanks in advance and Good Year for everything
(Sorry for my bud English)
Hector