What size coaxial should I make?

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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noname
First Sergeant 4
First Sergeant 4
Posts: 2698
Joined: Mon Apr 10, 2006 9:19 pm
Location: Bay Area, CA

Don't expect the performance to be great. My most recent coaxial pistol has a 1/2" barrel and a 2" chamber but only shoots about 150 feet.
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