that HHB looks pretty straight,nice luck ya got there.
not sure where your at,but here in mn the hhb rarely ever gets bigger than that in diameter. its a real dense heavy tight ringed wood,taked for ever for it to grow big.
the one and only that i got my hands on,from a friend,when i split it ,tried to be very carefull,ended up with about 120 degree of twist,even though the bark didnt look that bad.
god luck, we will all be waiting to see your next master pice from that.
peace,
tim