The skinny tank shown is regulated at 1100 PSI. Anyone know what the pressure needed for the Bulldog to push a .357 round downrange? My bet is over 2000 PSI
https://www.amazon.com/Ninja-Aluminum-HPA-Tank-3000/dp/B00IX0V7M4/ref=asc_df_B00IX0V7M4/?tag=bingshoppinga-20&linkCode=df0&hvadid={creative}&hvpos={adposition}&hvnetw=o&hvrand={random}&hvpone=&hvptwo=&hvqmt=e&hvdev=c&hvdvcmdl={devicemodel}&hvlocint=&hvlocphy=&hvtargid=pla-4584276296511249&psc=1 Quote, "you can remove 1 shim to reduce the pressure to 950psi. Ninja does not recommend using the 1100psi setting on your Tippmann marker." - so it's a bit light for a PCP.
Bulldog needs a 3000 PSI fill, so if you use a 13 cubic inch bottle to refill the Bulldog at 3000 PSI you might get one fill up to 2500 PSI or so, but because any paintball tank will be regulated at 1100 or below, no chance. Plus, if you try to fill the gun, the back pressure will probably destroy the regulator in the process.
To make it work, you'd need to dump the regulator, put some kind of valve on it like the 90/4500 tanks and have a fill station. By the time you do that, you might as well buy the 90/4500.
SO, now that I've done all this analysis, let me ask a couple stupid questions -
1. Do you intend to remove the tank currently on the Bulldog and use the skinny tank to replace the Bulldog tank?
2. if you intend to refill the Bulldog from the skinny tank, how do you plan on getting the air from skinny tank to the Bulldog? You'll need a fill station for that and those run $100 or so. What's the solution?
3. Since the skinny tank is regulated at 1100 PSI, how do you intend to increase the pressure sufficiently to fill the Bulldog that will probably have at least 2000PSI still in the tank?
If you can answer those questions, then you might have a chance at getting this contraption to work.