here are some books that may be helpful to guys interested in British cartridges and double rifles:
building double rifles on shotgun actions $65

British sporting rifle cartridges $75 with background info and full size photos of each

BRITISH SPORTING GUNS & RIFLES - 2 VOLUME SET OF OVER 1,000 PAGES OF ANTIQUE BRITISH GUNMAKER CATALOGS . 19 MAKERS ARE COVERED, INCLUDING H&H, JEFFERY, WESTLEY RICHARDS, RIGBY,GIBBS, GREENER, J.DICKSON, MIDLAND GUN CO, HALLOWAY, WEBLEY & SCOTT,BSA, JOSEPH LANG . THESE OLD CATALOGS ARE THE ONLY SOURCE OF INFO ON WHAT THE MAKERS OFFERED - RIFLES, SINGLE, DOUBLE & MAGAZINE , SHOTUNS, PARADOX GUNS, RELOADING TOOLS , AMMO ETC. 2 VOLUMES #300
ALL PLUS SHIPPING
CONTACT ME AT CABLETOOLS@ALLTEL.NET OR CALL 814 774 5739