SpudFiles

so i was just randomly thinking and figured i just put it up here, would there be a functional difference between a large chamber with low pressure ( around 50 psi) or a smaller chamber with a higher pressure ( say 400 psi) both holding the same amount of air, wouldn't the smaller chamber work better? i doubt it be much of a difference but it seems to me that it would

It depends on the projectile diameter .

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The composition of your projectile may limit practical impulse energy delivered to the projectile. Many of the Pumpkin Cannons are limited in air pressure due to the soft nature of the projectile. To transfer the energy, a longer barrel is used (often near 100 feet) and a larger lower pressure chamber is used.

The construction of your launcher may provide additional limits. A soda can launcher at high pressure will provide a heavy recoil at high pressure. A higher volume chamber and lower pressure can limit the recoil force and still reach high muzzle velocities. A 7 foot barrel at 100 PSI gives a good solid recoil kick. A smaller chamber at higher pressure could become unmanageable for a hand-held launcher.

Oops posted in the link bumping it. Post moved here where it belongs;

I like your numbers. I need to put together a fridge compressor for my Marshmallow cannon. In theory I can go to 300 PSI with it. With the 7 foot long TB barrel it should do a nice job.