It wasn't a rimfire, but I did take a grouse with a cast bullet from my 30-30 Marlin. It was on the forest floor, running and stopping about 35 yards away. A Lyman 31141 over 10 grains of Unique took it. I had a 170 grain jacketed in the chamber. I had to lever out 3 rounds to clear the rifle, then single load the cast bullet load.
Stringiest grouse I ever had.
