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Pony tank questio

I dont want to derail madeinuk's question so I'll ask here. If my gun holds 180cc of air which is roughly 11ci what size tank would give me say two refills if I'm out at the range or hunting and don't feel like bringing my compressor. Let's say I want to fill back up to full 4300 psi from 1900 or 2400 psi. I'm looking for something small I can stick in a midsized back pack if it exists and something that won't kill my compressor. 

Thanks in advance for any suggestions.
 
This calculator will give you an idea. 

http://www.calc.sikes.us/2/

Screenshot_20220110-200353_Chrome.1641866667.jpg

 
a quick estimation is how many shots do you get on your gun ... divide your guns tank into the pony ... if your gun is 200cc and you get a 500cc pony its like replacing your tank with it 'with' a higher fill if your pony is rated for it ... there will be some loss with bleeding etc but youd get a couple three fills easy ... thats what your looking for right ... if you want 150 fills get a 9L and strap it to your back lol ...