I've been away from this site for awhile, and just found this thread. Both SCI and DSC are great organizations. I've attended more than 30 SCI conventions and only one DSC convention, and that was about ten years ago. I was an independent contractor with contracts to produce SCI's publications from 1983 (soon after several of its founding chapters quit the club over a new rule that called for chapters to contribute 30% of the proceeds of their fund raisers to the larger organization) until I retired in 1999.
Today's Dallas Safari Club grew from that split and now has 5,000-6,000 members. As with SCI, its annual convention is its major fund raising event.
I've been far out of the loop at SCI since I retired, but I understand it now has 50,000 (plus or minus) members and about 200 chapters on six continents. Those chapters spend 70% of the fund-raising efforts on pro-hunting and wildlife conservation projects as they choose. This results in a wide range of conservation programs all over the globe.
SCI runs its conventions, publications, membership programs and legislative efforts, but its
separate SCI Foundation handles its conservation and education efforts. The foundation operates a ranch in Wyoming where a couple thousand teachers have received training in wildlife conservation education over the past three decades or so.
The headquarters for SCI/SCIF are in Tucson, Arizona. SCI's offices in Washington DC and in Canada are involved in pro-hunter legislation.
Bill Quimby