Dig,
Very nicely done. Believe it easily merits print in something like The Double Gun Journal. Give Daniel Philippe a call. He'd want a tad more on the gunsmithing, load developing for the Manton and some bird pictures with your hammergun. Only fact checking needed is on the banning of the .450 in India that came to be viewed as banning all .450 cartridges (.577/.450, .500/.450, .450 nitro etc) which is much more complicated and happened later than you suggest. See some posts by JPK or maybe it is 400 Nitro on this board or on
http://www.accuratereloading.com.Regards, Tim