barrel / air chamber ratio

Cannons powered by pneumatic pressure (compressed gas) using a valve or other release.
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Major Collins
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one of my past experiments had a 70cm copper barrel (10 mm inner diameter) and for the air chamber i had the same length copper tube but in 22 mm diameter.
I could only pump 110ish psi and becoming very difficult (using a bike pump)

power wasn't that great and pumping for a second time was was too tiring
why would this be?
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jackssmirkingrevenge
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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