Hi so i got a paintball co2 bottle like this
9 once and when its full of co2 i would like to know the pressure its held.
any here can help ?
Depends on CO2 cylinder type and size if they get a traditional regulator. You can find all the pressure and cylinder transfill information you want between paintball and welding forums.
I use both fixed pressure gaugeless regulators (fave is a 200psi Western Enterprises gaugeless) for my commercial CO2 cylinders I use for tire filling when towing cars and powering pneumatic tools. Beats buying expensive "power tank" kits when I can put a brass pneumatic chuck on the outlet and total cost ain't shit. (You can, and I have, repurpose "balloon regulators" the same way by replacing the inert gas inlet nipple with a CO2 nipple available at any local welding supply or online.
You can buy the fill fittings for paintball tanks then connect them to an adjustable regulator if you want. Western Enterprises has all the high pressure (DO NOT use hardware store parts!) hardware and lines you would need.
Paintball tanks are useless for anything but CO2 because CO2 stores as a liquid so you get much more output gas volume than from a same-sized vessel of compressed gas.
Kegerator kits are a cheap way to get useful CO2 cylinders. I've gotten a couple at yard sales then Ebayed the kit minus the cylinder. You can exchange the cylinder at any welding gas supply.