Be aware that if you go with ultra-light weight projectiles and low pressures... some combination will yield very high velocities. MY experience with 2,200 PSI and sabots under 50gr have gone supersonic.
Ya my AirForce Texan may have a couple of small mods… lol. I got sucked into the idea of finding and extending the rifles limits in distance shooting. I’ve taken jack rabbits as far out as 440 yards and can hit a man sized target out to 600… even in mild to medium winds gusting up to 15mph...
If you want to compare the Air Force Texan 50 Cal to a .308 Center fire rifle, the Air Force Texan is mild, I’d describe the Texan recoil as a firm yet smooth push against the shoulder, where a .308 has a snappy kick, and significantly more recoil.
I’m shootings my rile at 319bar on the high end and run 3 large air tanks at 450bar, this allows me to keep one tank on the compressor while shooting. I’ve been considering the booster pump and may add it to my toolbox as a backup.
Here we are tuning a .72 cal Zeus. A high quality regulator, a couple of large air talks and my spreadsheet are all you that’s needed to start making one ragged hole. Note: The larger the caliber the more air you consume.
Every rifle will have its own individual seeet spot for the pressure and power wheel. If you wish to maximize your rifle, read this and download the attachments for tuning. https://www.airgunnation.com/threads/how-to-tune-your-airforce-texan-for-max-velocity-with-very-little-waisted-air.1318159/