I'm very far from an expert but I shoot my Gamo regularly to keep the squirrels out of my bird feeders on my back deck. I'd even tolerate the squirrels if they'd share but they chase the birds away.

My rifle is a very inexpensive Gamo break barrel bought at Cabelas 25 yrs. ago. Caliber .177. Mounted a very cheap Tasco red dot expecting it to break but it hasn't. After many years of frustration with lead pellets I switched to Gamo Power Pellets which they call PBA Gold. They run faster than lead and are much more accurate in my Gamo. Lastly, it is very important to seat the pellet as straight as you can. I use a 22 LR round tip lead cartridge for seating. Since there's no lead in the pellet, I leave the dead squirrels for my neighborhood predators, i.e. barred owl(s), coyotes and red foxes.

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Bob.
SWCA 1821