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Shotgun shell type ammo

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Shotgun shell type ammo

Unread postAuthor: Acdcmonkey1991 » Sat Jun 09, 2007 4:32 pm

I'm currently working on a co2 quick change powered sawed off shotgun. The valve is an Orbit 3/4 in. sprinkler which is going to be actuated by the manual bleed. The barrel is going to be 1 in. copper pipe, I need help making some sort of shell/ cartridge that can hold bb gun bb's and can easily be exchanged out of the barrel. I was thinking a break barrel type loading thingy, but i'm open to suggestions

( i switched the diagrams
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Last edited by Acdcmonkey1991 on Sat Jun 09, 2007 4:55 pm, edited 1 time in total.
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Unread postAuthor: Velocity » Sat Jun 09, 2007 4:37 pm

I don't think a sprinkler valve is going to be able to handle the pressure created from an 800+ PSI quick change adapter, considering that the only chamber will be a threaded elbow.

Remember: P1V1 = P2V2
P1 is the pressure in the CO2 cylinder, V1 is the volume of the CO2 cylinder, and V2 is the volume of the CO2 cylinder and the chamber. You are going to wanted P2 to equal about 100 PSI.
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Unread postAuthor: Acdcmonkey1991 » Sat Jun 09, 2007 4:43 pm

well i want a really, powerfull sawed off shotgun, but i dont want to make it a piston type like brian the brains cuz i dont think i have the expierience, or the "know how". Do u have any other ideas for a good handle tank?, cuz i sure dont :P
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Unread postAuthor: Pete Zaria » Sat Jun 09, 2007 4:45 pm

rmich732 wrote:I don't think a sprinkler valve is going to be able to handle the pressure created from an 800+ PSI quick change adapter, considering that the only chamber will be a threaded elbow.

Remember: P1V1 = P2V2
P1 is the pressure in the CO2 cylinder, V1 is the volume of the CO2 cylinder, and V2 is the volume of the CO2 cylinder and the chamber. You are going to wanted P2 to equal about 100 PSI.


Dead-on correct.

CO2 powerlets or 12g's can be safely used on larger chamber volumes where they'll expand to a larger volume and MUCH lower pressure.
With a chamber as small as in your diagram, that sprinkler will be subjected to several hundred PSI and it WILL (not might, not probably, WILL) fail.
You need way more chamber space to use 12g CO2s.
Never push a sprinkler valve past its rated water pressure (usually about 125-150psi).

Peace,
Pete Zaria.
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Unread postAuthor: MrCrowley » Sat Jun 09, 2007 4:48 pm

For a break-barrel design you could buy a proper break-barrel shotgun stock, and then mount your gun to the shotgun stock. Then just use a break-barrel like goathunters and you should be fine.
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