[A. Patriot]

Here is a site I found that may help:

http://birdbgone.com/goosesupersonic.htm

You could buy a propane connon, but if you live in town, they would ride you out on a rail if you ever used it.

[A. Patriot]

Here is a propane cannon site:

http://www.suttonag.com/Zon.html