This chart shows an estimated amout of how many shots you will get from your CO2 or compressed air tank. These values generally represent a standard outdoor temperature of 20º C. Additional conditions apply, which are listed at the bottom of the page.

CO2 Carbon Dioxide Tanks:	HPA Compressed Air Tanks:
Size Shots 12-g 35 3.5-oz 150 7-oz 350 9-oz 425 12-oz 600 14-oz 700 16-oz 800 20-oz 1100 24-oz 1225 26-oz 1300 30-oz 1425 32-oz 1500 36-oz 1625	Size Shots (x-psi) 3000 4500 5000 45-cu 450 675 742 68-cu 680 1020 1122 88-cu 880 1320 1452 96-cu 960 1440 1584 110-cu 1100 1650 1815 114-cu 1140 1710 1881 128-cu 1280 1920 2112

· Shots per tank depends on the velocity of your marker. If you use a longer barrel, you are using a more volume of gas to propel the paintball to the desired velocity. The more the gas used, less shots per tank, obvioussly. Certain low-pressure markers alternately require a minimum length for the barrel; this if you use a shorter length then more air will similarily be required.
· With both CO2 and HPA, the colder the temperature becomes, the less shots per tank. This is because when the temperature lowers, so does the tank pressure. When tank pressure lowers, volume of gas used increased, and efficiency decreases.
· Pressure will begin to equalize itself with the outside air for the split-second that the gun's valve is open (when you fire the marker). For that brief moment the tank's temperature will drop slightly in accordance to the gas being pushed out, and as said before when temperature drops so does pressure, and when pressure drops you get less shots per tank. After the tank is closed off from the outside air, its temperature begins to normalize again, albeit slowly. Usually the tank does not get enough time to re-normalize the temperature of the gas thus you get less shots then theoretically possible. Because of this the numbers listed below are more theoretical then practical, as in if you were to fire your marker once per minute you would see higher values, however while playing you will probably see a bit less.
· Different markers experiance different efficiency rates. Stock Impulses, Shocker Sports, and Shocker SFTs get around 80% these numbers. With aftermarket bolts they will get much more (usually around 140%). Consult your marker's manual (or other source of info) for more specifics on exactly how much to expect.