I made those when I was a kid all the time, if you put one under an upside down 5 gallon bucket it will go above the tree tops.
At my dad's high school they used to blow the toiled off the wall with an M80 every now and then.
Did you consider the 7.5 horse 80 gal Ingersoll Rand that Northern sells with free shipping?
It puts out 24cfm and is $2000
http://www.northerntool.com/shop/tools/product_200414703_200414703
I'll probable end up buying that tool then. I plan on using a bunch of weather pack terminals to make the wiring harness for my jeep and that is a lot cheaper than most of the weatherpack crimpers.