Just checking Gerry, since you did not mention the gun model - are you sure it is regulated? That could have a lot to do with it . . .
I have a .22 caliber Air Ranger with a 17" barrel, and it came from the factory set up as a 50 FPE gun, and it could do that with heavy pellets (it made 48 FPE with JSB Beasts at 33.9 grain, and I was able to tune it up to 50FPE). It is an unregulated gun, and the sweet spot of the power curve was 2900 psi at that power level (so a 3175 gave me about 25 shots with an ES of 1.5%).
I found I was able to easily tune it down by making shorter hammer spring spacers, and could set it up as low as about half the energy shooting 16 grain pellets at about 24 FPE - using about an 1800 psi fill for the same count and ES as above).
By the way, the gun stated that the max fill was 250 bar (so 3625 psi), but it would always be in at least partial valve lock at that pressure - it would fire, but at a much lower speed. I found no matter how I tuned it, the max fill for keeping it under 3% ES at max power was about 3300 psi. Also, the hammer in those 50 FPE Air Rangers is heavy - a bit over 100 grams if I recall correctly. That said, it has a great snappy shot cycle at the lower power tunes and is a joy to shoot like that, so that is where it lives now (~32 FPE) - I even fabbed an internal SSG for it so it works great as a very high shot count plinker too - if I'm willing to tolerate a ~70 FPS ES on a 930 FPS max speed, I get over 100 shots on a 2400 psi fill (shooting from 2400 down to about 1500 psi). That SSG made a huge difference on the backside of the curve, as the hammer used to bounce and waste air like crazy, but now it just fires once with a little less speed . . . .
Anyways, that is an unregulated data point at high power with a shorter barrel . . . .