see in this thread POHs from BE-300 & BE-350 mixed up..(they are different animals..
in general, getting a decent payload with good range out of tight places, nothing beats a
BE-200B, with High Float Gear & last but not least the FULL Raisbeck treatment ( i.e. props, leading edge, ram air recovery system, tail feathers & fully enclosed high float gear)..
dream plane, and it will do all the perf even when calculated with balanced field length (which the Raisbeck kit let's you use, if you deem you want to use them..)
Raisbeck King Air Performance Systems Main Page
Raisbeck King Air 200/B200 EPIC Performance Systems