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Hi Con,

The actual measures for the barrel were not too exact as I improvised a bit during the process. Actually the bull part of the barrel is the same as the Douglas barrel blank (turned smooth of course). From there on there is a negative radius turn in two and one half inches to a diameter of one inch. Muzzle is 0.485" - if my metric conversions are there

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Muzzle is 0.485"..... Way too thin for a .400 cal boltaction sportingrifle...even by H&H standard
You need a traditional stepdown barrel( a la mausers E-type), and a muzzledia @ .600", which is still very thin.
Your gunsmith(if he knows something about classic safari rifles), should be able to fit gun and balance it for you, with the correct drop for ironsights, and fast handling.