Tuning New Compact .22 FX Maverick owner here!

I would try it right where it is at for now, and order a chronograph asap. Without a chrony, you're basically wasting your time changing settings. I mean sure, we can tell you how to up the power, but we won't necessarily know what speed you're shooting or if the gun is tuned properly for the changed settings. You can up the 2nd reg pressure to 110 bar, and give the fine adjustment on the hammer spring 1-2 turns out. That will certainly up the power capability, but you'd really need a chronograph to find out where it's happy place is with the power wheel. You don't have to get the $200 FX chrony, you can always get a Caldwell, or Pro chrony for $100, and they work just fine.

A chronograph is a MUST HAVE when tuning PCPs, and all settings aren't universal. The same settings on two different guns can yield different results depending on other factors. I hope that helps  

I second Rallyshark's suggests particularly with the need for a chronograph. The best thing is to start even with your adjustment screw bottomed out and gradually work your way up with the velocity. Shoot the rifle with the current 2nd regulator setting though it will more than likely need to be adjusted up. Add some more preload on the hammer adjustment spring out in 1/4 to 1/2 turns and see if the velocity goes up. If it levels out or even drops a little add 5 bars to the reg pressure and continue the process to you reach your desired velocity. I will add it would good to have your rifle set-up to shoot the range of pellets and slug weights to fit your needs within the power wheel adjustments. For example if you intend to shoot 15.89 JSB's up to the FX 22 grain hybrids it would be good to be able to set your power wheel to shoot the JSB 15's at an lower speed between 800 and 900 fps to be accurate for a pellet. Then turn up the power wheel #7 to shoot the FX Hybrids at 900 to 975 fps which they can handle and be accurate. I will add those FX Hybrids can be expensive but they do have exceptional expansion if needed for hunting. If you don't need the expansion the NSA's will be a lot less expensive to use for longer range shooting. The other thing you could do is buy some H&N Baracuda's which weigh 21.14 grains about the same as the Hybrids and use them to work up your regulator/hammer spring adjustments. Then when close to your wanted velocity fine turn with the Hybrids. Bill

After reading this....FX Chrony...is ordered and on the way.....only makes sense....you can not know what you don't know....;

After reading this....FX Chrony...is ordered and on the way.....only makes sense....you can not know what you don't know....;

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Absolutely!