Dave Russell is a gifted flutist (including bass flute), clarinetist, and saxophone player, as well as a composer. He also happens to me my son-in-law. He has written some very good big band charts you can find at:
Rocky Mountain Composers
A group of 10 composers from in and around Boulder, CO who have banded together to support each other, have regular concerts of new music, and sponsor a yearly composition competition for young (up to 18 years of age) composers.