Winchestermodel70 offered good advice. The only thing I might add is to be prepared to spend some significant dollars if you decide to have it mounted and shipped back.
I just got one back from the RSA and it cost me around $3000, when all was said and done, with taxidermy, air freight and ground transportation.
Also, the .416 Rigby is a fine choice of calibers. And yes, you can put them on the ground with the first shot, but it doesn't happen very often.
donsm70
