Numbers with Benjy tank installed.
Got the Benjy tank aired up to 3000 psi and have 20 shots thru the gun so far. Gun is a bone stock 18″ .177 with no adjustments to the TH. Power wheel is on 8.
Velocity is 603 – 605 fps with 8.30 grain RWS Super Domes. After 20 shots the meter on the tank is now reading just a pinch below 3000 or about 2900 psi.
With co2 in this same gun I am getting 710 fps with Super Domes.
I am just learning about these Airforce rifles and could use some input on the results I am getting with the regulated Benjy tank. Not very powerful but it ought to get about 200 shots from one fill 😆
So what do you Guy’s think ?? I was expecting more velocity … or maybe you can tell me how to coax more umph out of it.
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How much room is in that adapter for the air to expand?.
The problem might be there is not a lot of room for the regulated air to sit in reserve when the top hat opens. Maybe there is just not enough air volume. CO2 is another beast and the gases can expand from liquid rather quickly even all the way down the barrel.
I turned the PW all the way up and then backed it off one full turn … velocity with Super Domes increased to 712 fps.
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I see what you are saying … I am new to all of this and never thought of that. Increasing the PW to just about maximum netted me another 105 fps or so.