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I have built several pneumatic and combustion guns. John Deere starting fluid works best in a combustion gun. (minimum 80% diethyl ether, as opposed to 40-50% for the cheap stuff).
A properly set up pneumatic launcher can move things a lot farther. But I would recommend building a scatterblanket around the chamber in case something went wrong. I used the legs off of 3 junk pairs of jeans and about 2 rolls of good duct tape on my first gun, and it held when a glue joint failed at 110 PSI.
I would also recommend filling them with water before charging them with air for the first time. if it does fail, the pieces won't go flying all over ground zero- I mean the test site.
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