Check out nitroexpress.com and africahunting.com pretty sure it has co e up on at least one of them.
Would be a nice thumper. Check and see if Woodleigh bullets make any in that calibre, I can't remember what exact .4 cal the 400 actually is.
Check out Stager Sports for barrels, it is bloody hard to find on their website but they are now making barrels in African calibres. Otherwise Allan Carr gunsmith is your man.
Here is a link http://www.africahunting.com/threads...9/#post-206011
And another http://www.africahunting.com/threads/400-h-h.21018/
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