If you want to get into casting Mick, Dave Commons who run Cast Bullet Engineering has great moulds in a lot of calibres including those for the .404J.
http://www.castbulletengineering.com.au/bullet-moulds/rifle/404-calibre
Eagle27 & Von Gruff are the experts on Light-Medium loads for this great round, which are better suited for pigs etc.
I have used their loads & they are rather accurate - just not on any game yet!