Two links to .303 ammunition information

General comments on the .303 including head stamp code
Courtesy of Harrington Aviation Museum Society

http://www.harringtonmuseum.org.uk/303CartRTT.htm

Hand loading the .303 by C.E. Harris

http://www.public.asu.edu/~roblewis/SMLE/IIID2a11a4.html

Regards,

Norman