We live on 5 acres in the country and have thousands of squirrels, not exaggerating, because the property is covered in Oaks and Hickories, it also butts up to over 100K acres of Federal reserve property. All the neighbors are on 2-3 acre lots. I have settled on Aquilla Super Colibri after trying every rimfire round listed above and then some because noise, richchetts, and over penetration which are my concern with close neighbors. I have a table just for one set up 20 yards from a sliding glass door and get almost silent one shot kills from a 24" barrel 99 % of the time. Kills coons just as one shot dead with good shot placement in the head. I shoot about a brick a month and have been for years. Aquilla makes two Colibris- Colibris @ 375 fps and Super Colibri @ 540 fps. I use the Supers most of the time on anything bigger than a chipmunk.
https://www.youtube.com/watch?v=KX7...s3C346_Fe7H&index=79&app=desktop
