My brother is visiting us in CA, he found a Savage 10FP in .308 (in my safe) and he wants to bring it back home.  What does he need to transfer it?  

Is there someone in Hilo that can help?

If he can legally obtain "Ownership /Possesion" in CA of the rifle.  "in his name"  He can just bring it back via his Airline flt. in a locked container. (per Airlines and FAA guildlines)
134-3
Every person arriving in the State who brings or by any other manner causes to be brought into the State a firearm of any description, whether usable or unusable, serviceable or unserviceable, modern or antique, shall register the firearm within three days after arrival of the person or of the firearm, whichever arrives later, with the chief of police of the county of the person's place of business or, if there is no place of business, the person's residence ....A nonresident alien may bring firearms not otherwise prohibited by law into the State for a continuous period not to exceed ninety days; provided that the person meets the registration requirement of this section and the person possesses:



If not, it will need to be mailed to an FFL in the state of HI.

134-2
Permits to acquire. (a) No person shall acquire the ownership of a firearm, whether usable or unusable, serviceable or unserviceable, modern or antique, registered under prior law or by a prior owner or unregistered, either by purchase, gift, inheritance, bequest, or in any other manner, whether procured in the State or imported by mail, express, freight, or otherwise, until the person has first procured from the chief of police of the county of the person's place of ....

SUKA to the rescue.....lol  You should start a thread for people that have questions concerning firearm laws in HI.  Just put a disclaimer so you can't be sued.

....HPD Link.....

There is no 14-day waiting period for out of state registration. Once the firearm arrives in the state you have 3 calendar days to bring it, with valid photo identification and proof of citizenship if born outside the United States, to the HPD Firearms Section.