I finally got a chance to shoot my 2240 after I installed Art's power adjuster on it. I must say that this little accessory was worth every penny, not only does it look great, but it works great as well. With the power adjuster installed I was able to get about an extra 50 FPS out of my gun. I get an average of 625 FPS shooting Beeman FTS 14.6gr with the power adjuster turned up 3/4 of the way. If I turn it up to the max I can get a bit higher but the shot consistancy drops, I got a shot of 639 FPS with it turned all the way up. If I turn it down to the lowest setting I get around 500 FPS, which is nice for plinking at the target and conserving CO2.
In the 2nd picture below you can see the high power setting shot I got of 639 FPS. In the 3rd picture below you can see a 5 shot group I got with the adjuster 3/4 of the way turned up at an average of 625 FPS. I am very pleased with this new addition to my gun, I highly recommend getting one for your 22XX if you are looking to either increase power or increase shot count or both.
P.S. All of these chrony numbers were taken using Beeman FTS 14.6gr pellets.