CO2 Rifle Dilema

If you want power and range you might think about one of these PCP guns. One is a co2 or PCP gun and includes a pump in the price the other has a built in pump

https://www.airgundepot.com/benjamin-discovery-air-rifle-combo.html

https://www.pyramydair.com/s/m/Seneca_Aspen_PCP_Air_Rifle/4715

Otherwise here is a decent co2 repeater..

https://topairgun.com/product/177-hammerli-850-airmagnum-ambi-stock-co2-pellet-rifle/

A Chinese copy of a Crosman co2 gun?

https://www.airgundepot.com/beeman-qb78-deluxe-air-rifle.html

Or build your own gun at Crosman's Custom shop

https://www.crosman.com/custom-shop/

The Crosman guns have a huge following and loads of aftermarket parts for upgrades including the power type. The AR15 of co2 guns.

These are just a few of the co2 guns out there. Most of the single shot guns will shoot with near the same power level as they are co2 powered.