I was plinking in my backyard then the other side of my property I saw him running around. Used jsb exact heavies tonight, he was about 30-35 yards away. I flipped him over expecting to see a large exit but no, just sailed right through.
My .25 jsb exact king 25.39 grain are going right through also. Shot one yesterday straight through both ears. While pellets don't mushroom picture worthy in chipmunks, .25 certainly puts them down humanely.